Finding the Fourth Proportional to 61,680.71, 92,557.98 and 56,661.55

Step by Step Solution

1. Step 1: Write the proportion equation
   61,680.71 : 92,557.98 = 56,661.55 : x
2. Step 2: Convert to fraction form
   61,680.71/92,557.98 = 56,661.55/x
3. Step 3: Cross multiply
   61,680.71x = 92,557.98 × 56,661.55
4. Step 4: Simplify right side
   61,680.71x = 5,244,478,380.27
5. Step 5: Solve for x
   x = 5,244,478,380.27/61,680.71
6. Step 6: Final answer
   x = 85,026.23