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Finding the Fourth Proportional to 92,978.57, 128,372.22 and 71,429.94

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Solution

The fourth proportional to 92,978.57, 128,372.22 and 71,429.94 is: 98,620.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,978.57 : 128,372.22 = 71,429.94 : x
  2. Step 2: Convert to fraction form
    92,978.57/128,372.22 = 71,429.94/x
  3. Step 3: Cross multiply
    92,978.57x = 128,372.22 × 71,429.94
  4. Step 4: Simplify right side
    92,978.57x = 9,169,619,972.27
  5. Step 5: Solve for x
    x = 9,169,619,972.27/92,978.57
  6. Step 6: Final answer
    x = 98,620.79

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