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Finding the Fourth Proportional to 129,000.06, 178,000.74 and 72,400.50

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Solution

The fourth proportional to 129,000.06, 178,000.74 and 72,400.50 is: 99,901.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,000.06 : 178,000.74 = 72,400.50 : x
  2. Step 2: Convert to fraction form
    129,000.06/178,000.74 = 72,400.50/x
  3. Step 3: Cross multiply
    129,000.06x = 178,000.74 × 72,400.50
  4. Step 4: Simplify right side
    129,000.06x = 12,887,342,576.37
  5. Step 5: Solve for x
    x = 12,887,342,576.37/129,000.06
  6. Step 6: Final answer
    x = 99,901.83

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