Finding the Fourth Proportional to 156,615.48, 216,308.79 and 103,139.52

Step by Step Solution

1. Step 1: Write the proportion equation
   156,615.48 : 216,308.79 = 103,139.52 : x
2. Step 2: Convert to fraction form
   156,615.48/216,308.79 = 103,139.52/x
3. Step 3: Cross multiply
   156,615.48x = 216,308.79 × 103,139.52
4. Step 4: Simplify right side
   156,615.48x = 22,309,984,772.38
5. Step 5: Solve for x
   x = 22,309,984,772.38/156,615.48
6. Step 6: Final answer
   x = 142,450.70