Finding the Fourth Proportional to 1,112.84, 1,535.88 and 687.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.84 : 1,535.88 = 687.72 : x
2. Step 2: Convert to fraction form
   1,112.84/1,535.88 = 687.72/x
3. Step 3: Cross multiply
   1,112.84x = 1,535.88 × 687.72
4. Step 4: Simplify right side
   1,112.84x = 1,056,255.39
5. Step 5: Solve for x
   x = 1,056,255.39/1,112.84
6. Step 6: Final answer
   x = 949.15