Finding the Fourth Proportional to 665,300.10, 996,801.98 and 309,584.55

Step by Step Solution

1. Step 1: Write the proportion equation
   665,300.10 : 996,801.98 = 309,584.55 : x
2. Step 2: Convert to fraction form
   665,300.10/996,801.98 = 309,584.55/x
3. Step 3: Cross multiply
   665,300.10x = 996,801.98 × 309,584.55
4. Step 4: Simplify right side
   665,300.10x = 308,594,490,869.49
5. Step 5: Solve for x
   x = 308,594,490,869.49/665,300.10
6. Step 6: Final answer
   x = 463,842.54