Finding the Fourth Proportional to 2,118.52, 3,175.68 and 886.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.52 : 3,175.68 = 886.78 : x
2. Step 2: Convert to fraction form
   2,118.52/3,175.68 = 886.78/x
3. Step 3: Cross multiply
   2,118.52x = 3,175.68 × 886.78
4. Step 4: Simplify right side
   2,118.52x = 2,816,129.51
5. Step 5: Solve for x
   x = 2,816,129.51/2,118.52
6. Step 6: Final answer
   x = 1,329.29