Finding the Fourth Proportional to 108,689.55, 149,818.23 and 85,681.86

Step by Step Solution

1. Step 1: Write the proportion equation
   108,689.55 : 149,818.23 = 85,681.86 : x
2. Step 2: Convert to fraction form
   108,689.55/149,818.23 = 85,681.86/x
3. Step 3: Cross multiply
   108,689.55x = 149,818.23 × 85,681.86
4. Step 4: Simplify right side
   108,689.55x = 12,836,704,608.31
5. Step 5: Solve for x
   x = 12,836,704,608.31/108,689.55
6. Step 6: Final answer
   x = 118,104.31