Finding the Fourth Proportional to 1,042.89, 1,439.29 and 649.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,042.89 : 1,439.29 = 649.95 : x
2. Step 2: Convert to fraction form
   1,042.89/1,439.29 = 649.95/x
3. Step 3: Cross multiply
   1,042.89x = 1,439.29 × 649.95
4. Step 4: Simplify right side
   1,042.89x = 935,466.54
5. Step 5: Solve for x
   x = 935,466.54/1,042.89
6. Step 6: Final answer
   x = 896.99