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Finding the Fourth Proportional to 129,690.96, 178,975.56 and 72,328.72

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Solution

The fourth proportional to 129,690.96, 178,975.56 and 72,328.72 is: 99,814.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,690.96 : 178,975.56 = 72,328.72 : x
  2. Step 2: Convert to fraction form
    129,690.96/178,975.56 = 72,328.72/x
  3. Step 3: Cross multiply
    129,690.96x = 178,975.56 × 72,328.72
  4. Step 4: Simplify right side
    129,690.96x = 12,945,073,166.08
  5. Step 5: Solve for x
    x = 12,945,073,166.08/129,690.96
  6. Step 6: Final answer
    x = 99,814.77

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