Finding the Fourth Proportional to 2,085.24, 3,129.24 and 989.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.24 : 3,129.24 = 989.73 : x
2. Step 2: Convert to fraction form
   2,085.24/3,129.24 = 989.73/x
3. Step 3: Cross multiply
   2,085.24x = 3,129.24 × 989.73
4. Step 4: Simplify right side
   2,085.24x = 3,097,102.71
5. Step 5: Solve for x
   x = 3,097,102.71/2,085.24
6. Step 6: Final answer
   x = 1,485.25