Finding the Fourth Proportional to 2,080.24, 3,118.15 and 909.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.24 : 3,118.15 = 909.21 : x
2. Step 2: Convert to fraction form
   2,080.24/3,118.15 = 909.21/x
3. Step 3: Cross multiply
   2,080.24x = 3,118.15 × 909.21
4. Step 4: Simplify right side
   2,080.24x = 2,835,053.16
5. Step 5: Solve for x
   x = 2,835,053.16/2,080.24
6. Step 6: Final answer
   x = 1,362.85