Finding the Fourth Proportional to 2,107.20, 3,161.52 and 1,866.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,107.20 : 3,161.52 = 1,866.72 : x
2. Step 2: Convert to fraction form
   2,107.20/3,161.52 = 1,866.72/x
3. Step 3: Cross multiply
   2,107.20x = 3,161.52 × 1,866.72
4. Step 4: Simplify right side
   2,107.20x = 5,901,672.61
5. Step 5: Solve for x
   x = 5,901,672.61/2,107.20
6. Step 6: Final answer
   x = 2,800.72