Finding the Fourth Proportional to 2,086.52, 3,128.37 and 786.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.52 : 3,128.37 = 786.89 : x
2. Step 2: Convert to fraction form
   2,086.52/3,128.37 = 786.89/x
3. Step 3: Cross multiply
   2,086.52x = 3,128.37 × 786.89
4. Step 4: Simplify right side
   2,086.52x = 2,461,683.07
5. Step 5: Solve for x
   x = 2,461,683.07/2,086.52
6. Step 6: Final answer
   x = 1,179.80