Finding the Fourth Proportional to 2,080.32, 3,113.22 and 1,289.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.32 : 3,113.22 = 1,289.30 : x
2. Step 2: Convert to fraction form
   2,080.32/3,113.22 = 1,289.30/x
3. Step 3: Cross multiply
   2,080.32x = 3,113.22 × 1,289.30
4. Step 4: Simplify right side
   2,080.32x = 4,013,874.55
5. Step 5: Solve for x
   x = 4,013,874.55/2,080.32
6. Step 6: Final answer
   x = 1,929.45