Finding the Fourth Proportional to 158,611.50, 218,903.31 and 91,543.50

Step by Step Solution

1. Step 1: Write the proportion equation
   158,611.50 : 218,903.31 = 91,543.50 : x
2. Step 2: Convert to fraction form
   158,611.50/218,903.31 = 91,543.50/x
3. Step 3: Cross multiply
   158,611.50x = 218,903.31 × 91,543.50
4. Step 4: Simplify right side
   158,611.50x = 20,039,175,158.99
5. Step 5: Solve for x
   x = 20,039,175,158.99/158,611.50
6. Step 6: Final answer
   x = 126,341.25