Finding the Fourth Proportional to 61,689.31, 85,274.72 and 55,040.83

Step by Step Solution

1. Step 1: Write the proportion equation
   61,689.31 : 85,274.72 = 55,040.83 : x
2. Step 2: Convert to fraction form
   61,689.31/85,274.72 = 55,040.83/x
3. Step 3: Cross multiply
   61,689.31x = 85,274.72 × 55,040.83
4. Step 4: Simplify right side
   61,689.31x = 4,693,591,366.82
5. Step 5: Solve for x
   x = 4,693,591,366.82/61,689.31
6. Step 6: Final answer
   x = 76,084.36