Finding the Fourth Proportional to 1,100.88, 1,517.51 and 820.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.88 : 1,517.51 = 820.69 : x
2. Step 2: Convert to fraction form
   1,100.88/1,517.51 = 820.69/x
3. Step 3: Cross multiply
   1,100.88x = 1,517.51 × 820.69
4. Step 4: Simplify right side
   1,100.88x = 1,245,403.54
5. Step 5: Solve for x
   x = 1,245,403.54/1,100.88
6. Step 6: Final answer
   x = 1,131.28