Finding the Fourth Proportional to 1,520.82, 2,099.12 and 991.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.82 : 2,099.12 = 991.15 : x
2. Step 2: Convert to fraction form
   1,520.82/2,099.12 = 991.15/x
3. Step 3: Cross multiply
   1,520.82x = 2,099.12 × 991.15
4. Step 4: Simplify right side
   1,520.82x = 2,080,542.79
5. Step 5: Solve for x
   x = 2,080,542.79/1,520.82
6. Step 6: Final answer
   x = 1,368.04