Finding the Fourth Proportional to 428,674.59, 642,880.57 and 296,404.83

Step by Step Solution

1. Step 1: Write the proportion equation
   428,674.59 : 642,880.57 = 296,404.83 : x
2. Step 2: Convert to fraction form
   428,674.59/642,880.57 = 296,404.83/x
3. Step 3: Cross multiply
   428,674.59x = 642,880.57 × 296,404.83
4. Step 4: Simplify right side
   428,674.59x = 190,552,906,061.15
5. Step 5: Solve for x
   x = 190,552,906,061.15/428,674.59
6. Step 6: Final answer
   x = 444,516.45