Finding the Fourth Proportional to 1,112.47, 1,535.18 and 615.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.47 : 1,535.18 = 615.10 : x
2. Step 2: Convert to fraction form
   1,112.47/1,535.18 = 615.10/x
3. Step 3: Cross multiply
   1,112.47x = 1,535.18 × 615.10
4. Step 4: Simplify right side
   1,112.47x = 944,289.22
5. Step 5: Solve for x
   x = 944,289.22/1,112.47
6. Step 6: Final answer
   x = 848.82