Finding the Fourth Proportional to 661,026.72, 912,234.24 and 359,220.72

Step by Step Solution

1. Step 1: Write the proportion equation
   661,026.72 : 912,234.24 = 359,220.72 : x
2. Step 2: Convert to fraction form
   661,026.72/912,234.24 = 359,220.72/x
3. Step 3: Cross multiply
   661,026.72x = 912,234.24 × 359,220.72
4. Step 4: Simplify right side
   661,026.72x = 327,693,440,501.45
5. Step 5: Solve for x
   x = 327,693,440,501.45/661,026.72
6. Step 6: Final answer
   x = 495,734.03