Finding the Fourth Proportional to 1,920.50, 2,650.49 and 1,257.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,920.50 : 2,650.49 = 1,257.72 : x
2. Step 2: Convert to fraction form
   1,920.50/2,650.49 = 1,257.72/x
3. Step 3: Cross multiply
   1,920.50x = 2,650.49 × 1,257.72
4. Step 4: Simplify right side
   1,920.50x = 3,333,567.99
5. Step 5: Solve for x
   x = 3,333,567.99/1,920.50
6. Step 6: Final answer
   x = 1,735.79