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Finding the Fourth Proportional to 76,721.76, 105,868.44 and 56,589.48

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Solution

The fourth proportional to 76,721.76, 105,868.44 and 56,589.48 is: 78,087.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,721.76 : 105,868.44 = 56,589.48 : x
  2. Step 2: Convert to fraction form
    76,721.76/105,868.44 = 56,589.48/x
  3. Step 3: Cross multiply
    76,721.76x = 105,868.44 × 56,589.48
  4. Step 4: Simplify right side
    76,721.76x = 5,991,039,968.01
  5. Step 5: Solve for x
    x = 5,991,039,968.01/76,721.76
  6. Step 6: Final answer
    x = 78,087.88

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