Finding the Fourth Proportional to 661,020.72, 912,226 and 359,214.72

Step by Step Solution

1. Step 1: Write the proportion equation
   661,020.72 : 912,226 = 359,214.72 : x
2. Step 2: Convert to fraction form
   661,020.72/912,226 = 359,214.72/x
3. Step 3: Cross multiply
   661,020.72x = 912,226 × 359,214.72
4. Step 4: Simplify right side
   661,020.72x = 327,685,007,166.72
5. Step 5: Solve for x
   x = 327,685,007,166.72/661,020.72
6. Step 6: Final answer
   x = 495,725.77