Finding the Fourth Proportional to 1,375.38, 1,897.92 and 815.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.38 : 1,897.92 = 815.85 : x
2. Step 2: Convert to fraction form
   1,375.38/1,897.92 = 815.85/x
3. Step 3: Cross multiply
   1,375.38x = 1,897.92 × 815.85
4. Step 4: Simplify right side
   1,375.38x = 1,548,418.03
5. Step 5: Solve for x
   x = 1,548,418.03/1,375.38
6. Step 6: Final answer
   x = 1,125.81