Finding the Fourth Proportional to 2,101.04, 3,152.72 and 990.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.04 : 3,152.72 = 990.24 : x
2. Step 2: Convert to fraction form
   2,101.04/3,152.72 = 990.24/x
3. Step 3: Cross multiply
   2,101.04x = 3,152.72 × 990.24
4. Step 4: Simplify right side
   2,101.04x = 3,121,949.45
5. Step 5: Solve for x
   x = 3,121,949.45/2,101.04
6. Step 6: Final answer
   x = 1,485.91