Finding the Fourth Proportional to 1,118.52, 1,540.86 and 786.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.52 : 1,540.86 = 786.30 : x
2. Step 2: Convert to fraction form
   1,118.52/1,540.86 = 786.30/x
3. Step 3: Cross multiply
   1,118.52x = 1,540.86 × 786.30
4. Step 4: Simplify right side
   1,118.52x = 1,211,578.22
5. Step 5: Solve for x
   x = 1,211,578.22/1,118.52
6. Step 6: Final answer
   x = 1,083.20