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Finding the Fourth Proportional to 76,800.56, 105,985.26 and 42,811.21

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Solution

The fourth proportional to 76,800.56, 105,985.26 and 42,811.21 is: 59,079.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,800.56 : 105,985.26 = 42,811.21 : x
  2. Step 2: Convert to fraction form
    76,800.56/105,985.26 = 42,811.21/x
  3. Step 3: Cross multiply
    76,800.56x = 105,985.26 × 42,811.21
  4. Step 4: Simplify right side
    76,800.56x = 4,537,356,478.78
  5. Step 5: Solve for x
    x = 4,537,356,478.78/76,800.56
  6. Step 6: Final answer
    x = 59,079.73

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