Finding the Fourth Proportional to 1,375.25, 1,896.96 and 815.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.25 : 1,896.96 = 815.31 : x
2. Step 2: Convert to fraction form
   1,375.25/1,896.96 = 815.31/x
3. Step 3: Cross multiply
   1,375.25x = 1,896.96 × 815.31
4. Step 4: Simplify right side
   1,375.25x = 1,546,610.46
5. Step 5: Solve for x
   x = 1,546,610.46/1,375.25
6. Step 6: Final answer
   x = 1,124.60