Finding the Fourth Proportional to 665,223.86, 918,008.56 and 359,300.08

Step by Step Solution

1. Step 1: Write the proportion equation
   665,223.86 : 918,008.56 = 359,300.08 : x
2. Step 2: Convert to fraction form
   665,223.86/918,008.56 = 359,300.08/x
3. Step 3: Cross multiply
   665,223.86x = 918,008.56 × 359,300.08
4. Step 4: Simplify right side
   665,223.86x = 329,840,549,048.69
5. Step 5: Solve for x
   x = 329,840,549,048.69/665,223.86
6. Step 6: Final answer
   x = 495,833.91