Finding the Fourth Proportional to 2,086.00, 3,128.99 and 991.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.00 : 3,128.99 = 991.15 : x
2. Step 2: Convert to fraction form
   2,086.00/3,128.99 = 991.15/x
3. Step 3: Cross multiply
   2,086.00x = 3,128.99 × 991.15
4. Step 4: Simplify right side
   2,086.00x = 3,101,285.66
5. Step 5: Solve for x
   x = 3,101,285.66/2,086.00
6. Step 6: Final answer
   x = 1,486.72