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Finding the Fourth Proportional to 76,939.20, 115,408.80 and 72,273.60

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Solution

The fourth proportional to 76,939.20, 115,408.80 and 72,273.60 is: 108,410.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,939.20 : 115,408.80 = 72,273.60 : x
  2. Step 2: Convert to fraction form
    76,939.20/115,408.80 = 72,273.60/x
  3. Step 3: Cross multiply
    76,939.20x = 115,408.80 × 72,273.60
  4. Step 4: Simplify right side
    76,939.20x = 8,341,009,447.68
  5. Step 5: Solve for x
    x = 8,341,009,447.68/76,939.20
  6. Step 6: Final answer
    x = 108,410.40

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