Finding the Fourth Proportional to 83,711.31, 115,442.33 and 54,980.42

Step by Step Solution

1. Step 1: Write the proportion equation
   83,711.31 : 115,442.33 = 54,980.42 : x
2. Step 2: Convert to fraction form
   83,711.31/115,442.33 = 54,980.42/x
3. Step 3: Cross multiply
   83,711.31x = 115,442.33 × 54,980.42
4. Step 4: Simplify right side
   83,711.31x = 6,347,066,937.06
5. Step 5: Solve for x
   x = 6,347,066,937.06/83,711.31
6. Step 6: Final answer
   x = 75,820.90