Finding the Fourth Proportional to 2,088.09, 3,131.60 and 990.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,088.09 : 3,131.60 = 990.27 : x
2. Step 2: Convert to fraction form
   2,088.09/3,131.60 = 990.27/x
3. Step 3: Cross multiply
   2,088.09x = 3,131.60 × 990.27
4. Step 4: Simplify right side
   2,088.09x = 3,101,124.58
5. Step 5: Solve for x
   x = 3,101,124.58/2,088.09
6. Step 6: Final answer
   x = 1,485.15