Finding the Fourth Proportional to 1,375.15, 1,897.77 and 815.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.15 : 1,897.77 = 815.95 : x
2. Step 2: Convert to fraction form
   1,375.15/1,897.77 = 815.95/x
3. Step 3: Cross multiply
   1,375.15x = 1,897.77 × 815.95
4. Step 4: Simplify right side
   1,375.15x = 1,548,485.43
5. Step 5: Solve for x
   x = 1,548,485.43/1,375.15
6. Step 6: Final answer
   x = 1,126.05