Finding the Fourth Proportional to 1,057.20, 1,458.61 and 615.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.20 : 1,458.61 = 615.02 : x
2. Step 2: Convert to fraction form
   1,057.20/1,458.61 = 615.02/x
3. Step 3: Cross multiply
   1,057.20x = 1,458.61 × 615.02
4. Step 4: Simplify right side
   1,057.20x = 897,074.32
5. Step 5: Solve for x
   x = 897,074.32/1,057.20
6. Step 6: Final answer
   x = 848.54