Finding the Fourth Proportional to 646,264.89, 891,880.88 and 359,778.69

Step by Step Solution

1. Step 1: Write the proportion equation
   646,264.89 : 891,880.88 = 359,778.69 : x
2. Step 2: Convert to fraction form
   646,264.89/891,880.88 = 359,778.69/x
3. Step 3: Cross multiply
   646,264.89x = 891,880.88 × 359,778.69
4. Step 4: Simplify right side
   646,264.89x = 320,879,732,843.55
5. Step 5: Solve for x
   x = 320,879,732,843.55/646,264.89
6. Step 6: Final answer
   x = 496,514.26