Finding the Fourth Proportional to 661,299.15, 912,567.56 and 359,493.15

Step by Step Solution

1. Step 1: Write the proportion equation
   661,299.15 : 912,567.56 = 359,493.15 : x
2. Step 2: Convert to fraction form
   661,299.15/912,567.56 = 359,493.15/x
3. Step 3: Cross multiply
   661,299.15x = 912,567.56 × 359,493.15
4. Step 4: Simplify right side
   661,299.15x = 328,061,784,934.75
5. Step 5: Solve for x
   x = 328,061,784,934.75/661,299.15
6. Step 6: Final answer
   x = 496,086.81