Finding the Fourth Proportional to 661,099.50, 912,324.60 and 359,293.50

Step by Step Solution

1. Step 1: Write the proportion equation
   661,099.50 : 912,324.60 = 359,293.50 : x
2. Step 2: Convert to fraction form
   661,099.50/912,324.60 = 359,293.50/x
3. Step 3: Cross multiply
   661,099.50x = 912,324.60 × 359,293.50
4. Step 4: Simplify right side
   661,099.50x = 327,792,298,670.10
5. Step 5: Solve for x
   x = 327,792,298,670.10/661,099.50
6. Step 6: Final answer
   x = 495,828.99