Finding the Fourth Proportional to 1,039.46, 1,557.18 and 649.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.46 : 1,557.18 = 649.61 : x
2. Step 2: Convert to fraction form
   1,039.46/1,557.18 = 649.61/x
3. Step 3: Cross multiply
   1,039.46x = 1,557.18 × 649.61
4. Step 4: Simplify right side
   1,039.46x = 1,011,551.91
5. Step 5: Solve for x
   x = 1,011,551.91/1,039.46
6. Step 6: Final answer
   x = 973.15