Finding the Fourth Proportional to 2,085.40, 3,127.02 and 990.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.40 : 3,127.02 = 990.28 : x
2. Step 2: Convert to fraction form
   2,085.40/3,127.02 = 990.28/x
3. Step 3: Cross multiply
   2,085.40x = 3,127.02 × 990.28
4. Step 4: Simplify right side
   2,085.40x = 3,096,625.37
5. Step 5: Solve for x
   x = 3,096,625.37/2,085.40
6. Step 6: Final answer
   x = 1,484.91