Finding the Fourth Proportional to 663,796.71, 916,038.18 and 361,990.71

Step by Step Solution

1. Step 1: Write the proportion equation
   663,796.71 : 916,038.18 = 361,990.71 : x
2. Step 2: Convert to fraction form
   663,796.71/916,038.18 = 361,990.71/x
3. Step 3: Cross multiply
   663,796.71x = 916,038.18 × 361,990.71
4. Step 4: Simplify right side
   663,796.71x = 331,597,311,165.31
5. Step 5: Solve for x
   x = 331,597,311,165.31/663,796.71
6. Step 6: Final answer
   x = 499,546.48