Finding the Fourth Proportional to 2,087.82, 3,132.08 and 991.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.82 : 3,132.08 = 991.59 : x
2. Step 2: Convert to fraction form
   2,087.82/3,132.08 = 991.59/x
3. Step 3: Cross multiply
   2,087.82x = 3,132.08 × 991.59
4. Step 4: Simplify right side
   2,087.82x = 3,105,734.25
5. Step 5: Solve for x
   x = 3,105,734.25/2,087.82
6. Step 6: Final answer
   x = 1,487.55