Finding the Fourth Proportional to 2,112.88, 2,915.65 and 1,168.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.88 : 2,915.65 = 1,168.61 : x
2. Step 2: Convert to fraction form
   2,112.88/2,915.65 = 1,168.61/x
3. Step 3: Cross multiply
   2,112.88x = 2,915.65 × 1,168.61
4. Step 4: Simplify right side
   2,112.88x = 3,407,257.75
5. Step 5: Solve for x
   x = 3,407,257.75/2,112.88
6. Step 6: Final answer
   x = 1,612.61