Finding the Fourth Proportional to 1,112.77, 1,535.61 and 615.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.77 : 1,535.61 = 615.43 : x
2. Step 2: Convert to fraction form
   1,112.77/1,535.61 = 615.43/x
3. Step 3: Cross multiply
   1,112.77x = 1,535.61 × 615.43
4. Step 4: Simplify right side
   1,112.77x = 945,060.46
5. Step 5: Solve for x
   x = 945,060.46/1,112.77
6. Step 6: Final answer
   x = 849.29