Finding the Fourth Proportional to 2,085.28, 3,127.01 and 989.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.28 : 3,127.01 = 989.96 : x
2. Step 2: Convert to fraction form
   2,085.28/3,127.01 = 989.96/x
3. Step 3: Cross multiply
   2,085.28x = 3,127.01 × 989.96
4. Step 4: Simplify right side
   2,085.28x = 3,095,594.23
5. Step 5: Solve for x
   x = 3,095,594.23/2,085.28
6. Step 6: Final answer
   x = 1,484.50