Finding the Fourth Proportional to 156,328.72, 215,723.38 and 99,734

Step by Step Solution

1. Step 1: Write the proportion equation
   156,328.72 : 215,723.38 = 99,734 : x
2. Step 2: Convert to fraction form
   156,328.72/215,723.38 = 99,734/x
3. Step 3: Cross multiply
   156,328.72x = 215,723.38 × 99,734
4. Step 4: Simplify right side
   156,328.72x = 21,514,955,580.92
5. Step 5: Solve for x
   x = 21,514,955,580.92/156,328.72
6. Step 6: Final answer
   x = 137,626.38