Finding the Fourth Proportional to 156,300.80, 215,787.12 and 102,679.34

Step by Step Solution

1. Step 1: Write the proportion equation
   156,300.80 : 215,787.12 = 102,679.34 : x
2. Step 2: Convert to fraction form
   156,300.80/215,787.12 = 102,679.34/x
3. Step 3: Cross multiply
   156,300.80x = 215,787.12 × 102,679.34
4. Step 4: Simplify right side
   156,300.80x = 22,156,879,062.10
5. Step 5: Solve for x
   x = 22,156,879,062.10/156,300.80
6. Step 6: Final answer
   x = 141,757.94