Finding the Fourth Proportional to 2,086.88, 3,126.88 and 991.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.88 : 3,126.88 = 991.04 : x
2. Step 2: Convert to fraction form
   2,086.88/3,126.88 = 991.04/x
3. Step 3: Cross multiply
   2,086.88x = 3,126.88 × 991.04
4. Step 4: Simplify right side
   2,086.88x = 3,098,863.16
5. Step 5: Solve for x
   x = 3,098,863.16/2,086.88
6. Step 6: Final answer
   x = 1,484.93