Finding the Fourth Proportional to 498,047.96, 687,338.61 and 283,208

Step by Step Solution

1. Step 1: Write the proportion equation
   498,047.96 : 687,338.61 = 283,208 : x
2. Step 2: Convert to fraction form
   498,047.96/687,338.61 = 283,208/x
3. Step 3: Cross multiply
   498,047.96x = 687,338.61 × 283,208
4. Step 4: Simplify right side
   498,047.96x = 194,659,793,060.88
5. Step 5: Solve for x
   x = 194,659,793,060.88/498,047.96
6. Step 6: Final answer
   x = 390,845.48