Finding the Fourth Proportional to 156,111.60, 215,429.40 and 88,131

Step by Step Solution

1. Step 1: Write the proportion equation
   156,111.60 : 215,429.40 = 88,131 : x
2. Step 2: Convert to fraction form
   156,111.60/215,429.40 = 88,131/x
3. Step 3: Cross multiply
   156,111.60x = 215,429.40 × 88,131
4. Step 4: Simplify right side
   156,111.60x = 18,986,008,451.40
5. Step 5: Solve for x
   x = 18,986,008,451.40/156,111.60
6. Step 6: Final answer
   x = 121,618.18