Finding the Fourth Proportional to 498,081.72, 687,324.78 and 283,274.04

Step by Step Solution

1. Step 1: Write the proportion equation
   498,081.72 : 687,324.78 = 283,274.04 : x
2. Step 2: Convert to fraction form
   498,081.72/687,324.78 = 283,274.04/x
3. Step 3: Cross multiply
   498,081.72x = 687,324.78 × 283,274.04
4. Step 4: Simplify right side
   498,081.72x = 194,701,267,222.71
5. Step 5: Solve for x
   x = 194,701,267,222.71/498,081.72
6. Step 6: Final answer
   x = 390,902.25