Finding the Fourth Proportional to 2,086.12, 3,128.46 and 786.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.12 : 3,128.46 = 786.52 : x
2. Step 2: Convert to fraction form
   2,086.12/3,128.46 = 786.52/x
3. Step 3: Cross multiply
   2,086.12x = 3,128.46 × 786.52
4. Step 4: Simplify right side
   2,086.12x = 2,460,596.36
5. Step 5: Solve for x
   x = 2,460,596.36/2,086.12
6. Step 6: Final answer
   x = 1,179.51