Finding the Fourth Proportional to 1,112.56, 1,535.31 and 615.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.56 : 1,535.31 = 615.22 : x
2. Step 2: Convert to fraction form
   1,112.56/1,535.31 = 615.22/x
3. Step 3: Cross multiply
   1,112.56x = 1,535.31 × 615.22
4. Step 4: Simplify right side
   1,112.56x = 944,549.58
5. Step 5: Solve for x
   x = 944,549.58/1,112.56
6. Step 6: Final answer
   x = 848.99