Finding the Fourth Proportional to 2,399.12, 3,310.80 and 1,515.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.12 : 3,310.80 = 1,515.32 : x
2. Step 2: Convert to fraction form
   2,399.12/3,310.80 = 1,515.32/x
3. Step 3: Cross multiply
   2,399.12x = 3,310.80 × 1,515.32
4. Step 4: Simplify right side
   2,399.12x = 5,016,921.46
5. Step 5: Solve for x
   x = 5,016,921.46/2,399.12
6. Step 6: Final answer
   x = 2,091.15