Finding the Fourth Proportional to 1,375.17, 1,897.37 and 815.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.17 : 1,897.37 = 815.76 : x
2. Step 2: Convert to fraction form
   1,375.17/1,897.37 = 815.76/x
3. Step 3: Cross multiply
   1,375.17x = 1,897.37 × 815.76
4. Step 4: Simplify right side
   1,375.17x = 1,547,800.59
5. Step 5: Solve for x
   x = 1,547,800.59/1,375.17
6. Step 6: Final answer
   x = 1,125.53