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Finding the Fourth Proportional to 81,811.20, 122,716.80 and 57,964.80

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Solution

The fourth proportional to 81,811.20, 122,716.80 and 57,964.80 is: 86,947.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,811.20 : 122,716.80 = 57,964.80 : x
  2. Step 2: Convert to fraction form
    81,811.20/122,716.80 = 57,964.80/x
  3. Step 3: Cross multiply
    81,811.20x = 122,716.80 × 57,964.80
  4. Step 4: Simplify right side
    81,811.20x = 7,113,254,768.64
  5. Step 5: Solve for x
    x = 7,113,254,768.64/81,811.20
  6. Step 6: Final answer
    x = 86,947.20

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