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Finding the Fourth Proportional to 1,318,891.20, 1,978,992.90 and 520,198.80

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Solution

The fourth proportional to 1,318,891.20, 1,978,992.90 and 520,198.80 is: 780,556.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318,891.20 : 1,978,992.90 = 520,198.80 : x
  2. Step 2: Convert to fraction form
    1,318,891.20/1,978,992.90 = 520,198.80/x
  3. Step 3: Cross multiply
    1,318,891.20x = 1,978,992.90 × 520,198.80
  4. Step 4: Simplify right side
    1,318,891.20x = 1,029,469,731,788.52
  5. Step 5: Solve for x
    x = 1,029,469,731,788.52/1,318,891.20
  6. Step 6: Final answer
    x = 780,556.98

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