Finding the Fourth Proportional to 2,087.32, 3,127.38 and 991.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.32 : 3,127.38 = 991.24 : x
2. Step 2: Convert to fraction form
   2,087.32/3,127.38 = 991.24/x
3. Step 3: Cross multiply
   2,087.32x = 3,127.38 × 991.24
4. Step 4: Simplify right side
   2,087.32x = 3,099,984.15
5. Step 5: Solve for x
   x = 3,099,984.15/2,087.32
6. Step 6: Final answer
   x = 1,485.15