Finding the Fourth Proportional to 2,086.80, 3,128.12 and 1,043.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.80 : 3,128.12 = 1,043.62 : x
2. Step 2: Convert to fraction form
   2,086.80/3,128.12 = 1,043.62/x
3. Step 3: Cross multiply
   2,086.80x = 3,128.12 × 1,043.62
4. Step 4: Simplify right side
   2,086.80x = 3,264,571.20
5. Step 5: Solve for x
   x = 3,264,571.20/2,086.80
6. Step 6: Final answer
   x = 1,564.39