Finding the Fourth Proportional to 646,131.76, 891,641.98 and 359,644.48

Step by Step Solution

1. Step 1: Write the proportion equation
   646,131.76 : 891,641.98 = 359,644.48 : x
2. Step 2: Convert to fraction form
   646,131.76/891,641.98 = 359,644.48/x
3. Step 3: Cross multiply
   646,131.76x = 891,641.98 × 359,644.48
4. Step 4: Simplify right side
   646,131.76x = 320,674,116,243.27
5. Step 5: Solve for x
   x = 320,674,116,243.27/646,131.76
6. Step 6: Final answer
   x = 496,298.33