Finding the Fourth Proportional to 149,571.91, 206,401.12 and 85,909.72

Step by Step Solution

1. Step 1: Write the proportion equation
   149,571.91 : 206,401.12 = 85,909.72 : x
2. Step 2: Convert to fraction form
   149,571.91/206,401.12 = 85,909.72/x
3. Step 3: Cross multiply
   149,571.91x = 206,401.12 × 85,909.72
4. Step 4: Simplify right side
   149,571.91x = 17,731,862,426.89
5. Step 5: Solve for x
   x = 17,731,862,426.89/149,571.91
6. Step 6: Final answer
   x = 118,550.75