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Finding the Fourth Proportional to 85,309.76, 117,765.21 and 55,109.79

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Solution

The fourth proportional to 85,309.76, 117,765.21 and 55,109.79 is: 76,075.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,309.76 : 117,765.21 = 55,109.79 : x
  2. Step 2: Convert to fraction form
    85,309.76/117,765.21 = 55,109.79/x
  3. Step 3: Cross multiply
    85,309.76x = 117,765.21 × 55,109.79
  4. Step 4: Simplify right side
    85,309.76x = 6,490,015,992.41
  5. Step 5: Solve for x
    x = 6,490,015,992.41/85,309.76
  6. Step 6: Final answer
    x = 76,075.90

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