Finding the Fourth Proportional to 2,872.22, 4,307.49 and 1,311.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,872.22 : 4,307.49 = 1,311.39 : x
2. Step 2: Convert to fraction form
   2,872.22/4,307.49 = 1,311.39/x
3. Step 3: Cross multiply
   2,872.22x = 4,307.49 × 1,311.39
4. Step 4: Simplify right side
   2,872.22x = 5,648,799.31
5. Step 5: Solve for x
   x = 5,648,799.31/2,872.22
6. Step 6: Final answer
   x = 1,966.70