Finding the Fourth Proportional to 1,035.46, 1,428.71 and 615.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,035.46 : 1,428.71 = 615.95 : x
2. Step 2: Convert to fraction form
   1,035.46/1,428.71 = 615.95/x
3. Step 3: Cross multiply
   1,035.46x = 1,428.71 × 615.95
4. Step 4: Simplify right side
   1,035.46x = 880,020.56
5. Step 5: Solve for x
   x = 880,020.56/1,035.46
6. Step 6: Final answer
   x = 849.88