Finding the Fourth Proportional to 1,112.98, 1,535.91 and 615.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.98 : 1,535.91 = 615.71 : x
2. Step 2: Convert to fraction form
   1,112.98/1,535.91 = 615.71/x
3. Step 3: Cross multiply
   1,112.98x = 1,535.91 × 615.71
4. Step 4: Simplify right side
   1,112.98x = 945,675.15
5. Step 5: Solve for x
   x = 945,675.15/1,112.98
6. Step 6: Final answer
   x = 849.68