Finding the Fourth Proportional to 1,375.05, 1,896.94 and 815.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.05 : 1,896.94 = 815.20 : x
2. Step 2: Convert to fraction form
   1,375.05/1,896.94 = 815.20/x
3. Step 3: Cross multiply
   1,375.05x = 1,896.94 × 815.20
4. Step 4: Simplify right side
   1,375.05x = 1,546,380.90
5. Step 5: Solve for x
   x = 1,546,380.90/1,375.05
6. Step 6: Final answer
   x = 1,124.60