Finding the Fourth Proportional to 1,078.26, 1,488.06 and 815.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.26 : 1,488.06 = 815.82 : x
2. Step 2: Convert to fraction form
   1,078.26/1,488.06 = 815.82/x
3. Step 3: Cross multiply
   1,078.26x = 1,488.06 × 815.82
4. Step 4: Simplify right side
   1,078.26x = 1,213,989.11
5. Step 5: Solve for x
   x = 1,213,989.11/1,078.26
6. Step 6: Final answer
   x = 1,125.88