Finding the Fourth Proportional to 1,057.48, 1,458.72 and 615.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.48 : 1,458.72 = 615.33 : x
2. Step 2: Convert to fraction form
   1,057.48/1,458.72 = 615.33/x
3. Step 3: Cross multiply
   1,057.48x = 1,458.72 × 615.33
4. Step 4: Simplify right side
   1,057.48x = 897,594.18
5. Step 5: Solve for x
   x = 897,594.18/1,057.48
6. Step 6: Final answer
   x = 848.80