Finding the Fourth Proportional to 156,916.32, 235,191.96 and 72,499.20

Step by Step Solution

1. Step 1: Write the proportion equation
   156,916.32 : 235,191.96 = 72,499.20 : x
2. Step 2: Convert to fraction form
   156,916.32/235,191.96 = 72,499.20/x
3. Step 3: Cross multiply
   156,916.32x = 235,191.96 × 72,499.20
4. Step 4: Simplify right side
   156,916.32x = 17,051,228,946.43
5. Step 5: Solve for x
   x = 17,051,228,946.43/156,916.32
6. Step 6: Final answer
   x = 108,664.47