Finding the Fourth Proportional to 2,288.80, 3,433.56 and 990.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.80 : 3,433.56 = 990.28 : x
2. Step 2: Convert to fraction form
   2,288.80/3,433.56 = 990.28/x
3. Step 3: Cross multiply
   2,288.80x = 3,433.56 × 990.28
4. Step 4: Simplify right side
   2,288.80x = 3,400,185.80
5. Step 5: Solve for x
   x = 3,400,185.80/2,288.80
6. Step 6: Final answer
   x = 1,485.58