Finding the Fourth Proportional to 2,112.80, 2,915.60 and 1,168.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.80 : 2,915.60 = 1,168.65 : x
2. Step 2: Convert to fraction form
   2,112.80/2,915.60 = 1,168.65/x
3. Step 3: Cross multiply
   2,112.80x = 2,915.60 × 1,168.65
4. Step 4: Simplify right side
   2,112.80x = 3,407,310.10
5. Step 5: Solve for x
   x = 3,407,310.10/2,112.80
6. Step 6: Final answer
   x = 1,612.70