Finding the Fourth Proportional to 2,288.55, 3,430.89 and 989.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.55 : 3,430.89 = 989.04 : x
2. Step 2: Convert to fraction form
   2,288.55/3,430.89 = 989.04/x
3. Step 3: Cross multiply
   2,288.55x = 3,430.89 × 989.04
4. Step 4: Simplify right side
   2,288.55x = 3,393,287.45
5. Step 5: Solve for x
   x = 3,393,287.45/2,288.55
6. Step 6: Final answer
   x = 1,482.72