Finding the Fourth Proportional to 102,156.56, 140,978.76 and 61,877.60

Step by Step Solution

1. Step 1: Write the proportion equation
   102,156.56 : 140,978.76 = 61,877.60 : x
2. Step 2: Convert to fraction form
   102,156.56/140,978.76 = 61,877.60/x
3. Step 3: Cross multiply
   102,156.56x = 140,978.76 × 61,877.60
4. Step 4: Simplify right side
   102,156.56x = 8,723,427,319.78
5. Step 5: Solve for x
   x = 8,723,427,319.78/102,156.56
6. Step 6: Final answer
   x = 85,392.73