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Finding the Fourth Proportional to 128,518.41, 177,356.01 and 71,940.72

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Solution

The fourth proportional to 128,518.41, 177,356.01 and 71,940.72 is: 99,278.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,518.41 : 177,356.01 = 71,940.72 : x
  2. Step 2: Convert to fraction form
    128,518.41/177,356.01 = 71,940.72/x
  3. Step 3: Cross multiply
    128,518.41x = 177,356.01 × 71,940.72
  4. Step 4: Simplify right side
    128,518.41x = 12,759,119,055.73
  5. Step 5: Solve for x
    x = 12,759,119,055.73/128,518.41
  6. Step 6: Final answer
    x = 99,278.53

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