Finding the Fourth Proportional to 156,665.70, 235,128.15 and 72,555.30

Step by Step Solution

1. Step 1: Write the proportion equation
   156,665.70 : 235,128.15 = 72,555.30 : x
2. Step 2: Convert to fraction form
   156,665.70/235,128.15 = 72,555.30/x
3. Step 3: Cross multiply
   156,665.70x = 235,128.15 × 72,555.30
4. Step 4: Simplify right side
   156,665.70x = 17,059,793,461.70
5. Step 5: Solve for x
   x = 17,059,793,461.70/156,665.70
6. Step 6: Final answer
   x = 108,892.97