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Finding the Fourth Proportional to 3,990.78, 5,986.10 and 1,254.78

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Solution

The fourth proportional to 3,990.78, 5,986.10 and 1,254.78 is: 1,882.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.78 : 5,986.10 = 1,254.78 : x
  2. Step 2: Convert to fraction form
    3,990.78/5,986.10 = 1,254.78/x
  3. Step 3: Cross multiply
    3,990.78x = 5,986.10 × 1,254.78
  4. Step 4: Simplify right side
    3,990.78x = 7,511,238.56
  5. Step 5: Solve for x
    x = 7,511,238.56/3,990.78
  6. Step 6: Final answer
    x = 1,882.15

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