Finding the Fourth Proportional to 1,112.89, 1,535.57 and 615.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.89 : 1,535.57 = 615.50 : x
2. Step 2: Convert to fraction form
   1,112.89/1,535.57 = 615.50/x
3. Step 3: Cross multiply
   1,112.89x = 1,535.57 × 615.50
4. Step 4: Simplify right side
   1,112.89x = 945,144.11
5. Step 5: Solve for x
   x = 945,144.11/1,112.89
6. Step 6: Final answer
   x = 849.27