Finding the Fourth Proportional to 499,301.04, 688,493.55 and 317,780.72

Step by Step Solution

1. Step 1: Write the proportion equation
   499,301.04 : 688,493.55 = 317,780.72 : x
2. Step 2: Convert to fraction form
   499,301.04/688,493.55 = 317,780.72/x
3. Step 3: Cross multiply
   499,301.04x = 688,493.55 × 317,780.72
4. Step 4: Simplify right side
   499,301.04x = 218,789,972,591.89
5. Step 5: Solve for x
   x = 218,789,972,591.89/499,301.04
6. Step 6: Final answer
   x = 438,192.50