Finding the Fourth Proportional to 2,375.16, 3,562.79 and 815.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,375.16 : 3,562.79 = 815.15 : x
2. Step 2: Convert to fraction form
   2,375.16/3,562.79 = 815.15/x
3. Step 3: Cross multiply
   2,375.16x = 3,562.79 × 815.15
4. Step 4: Simplify right side
   2,375.16x = 2,904,213.10
5. Step 5: Solve for x
   x = 2,904,213.10/2,375.16
6. Step 6: Final answer
   x = 1,222.75