Finding the Fourth Proportional to 899,591.30, 1,241,401.94 and 491,689.78

Step by Step Solution

1. Step 1: Write the proportion equation
   899,591.30 : 1,241,401.94 = 491,689.78 : x
2. Step 2: Convert to fraction form
   899,591.30/1,241,401.94 = 491,689.78/x
3. Step 3: Cross multiply
   899,591.30x = 1,241,401.94 × 491,689.78
4. Step 4: Simplify right side
   899,591.30x = 610,384,646,770.17
5. Step 5: Solve for x
   x = 610,384,646,770.17/899,591.30
6. Step 6: Final answer
   x = 678,513.28