Finding the Fourth Proportional to 156,389.74, 215,815.50 and 88,404.32

Step by Step Solution

1. Step 1: Write the proportion equation
   156,389.74 : 215,815.50 = 88,404.32 : x
2. Step 2: Convert to fraction form
   156,389.74/215,815.50 = 88,404.32/x
3. Step 3: Cross multiply
   156,389.74x = 215,815.50 × 88,404.32
4. Step 4: Simplify right side
   156,389.74x = 19,079,022,522.96
5. Step 5: Solve for x
   x = 19,079,022,522.96/156,389.74
6. Step 6: Final answer
   x = 121,996.64