Finding the Fourth Proportional to 1,112.69, 1,535.51 and 615.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.69 : 1,535.51 = 615.33 : x
2. Step 2: Convert to fraction form
   1,112.69/1,535.51 = 615.33/x
3. Step 3: Cross multiply
   1,112.69x = 1,535.51 × 615.33
4. Step 4: Simplify right side
   1,112.69x = 944,842.29
5. Step 5: Solve for x
   x = 944,842.29/1,112.69
6. Step 6: Final answer
   x = 849.15