Finding the Fourth Proportional to 1,014.03, 1,399.41 and 615.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.03 : 1,399.41 = 615.78 : x
2. Step 2: Convert to fraction form
   1,014.03/1,399.41 = 615.78/x
3. Step 3: Cross multiply
   1,014.03x = 1,399.41 × 615.78
4. Step 4: Simplify right side
   1,014.03x = 861,728.69
5. Step 5: Solve for x
   x = 861,728.69/1,014.03
6. Step 6: Final answer
   x = 849.81