Finding the Fourth Proportional to 1,014.34, 1,399.56 and 615.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.34 : 1,399.56 = 615.88 : x
2. Step 2: Convert to fraction form
   1,014.34/1,399.56 = 615.88/x
3. Step 3: Cross multiply
   1,014.34x = 1,399.56 × 615.88
4. Step 4: Simplify right side
   1,014.34x = 861,961.01
5. Step 5: Solve for x
   x = 861,961.01/1,014.34
6. Step 6: Final answer
   x = 849.78