Finding the Fourth Proportional to 1,919.50, 2,648.19 and 1,256.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,919.50 : 2,648.19 = 1,256.72 : x
2. Step 2: Convert to fraction form
   1,919.50/2,648.19 = 1,256.72/x
3. Step 3: Cross multiply
   1,919.50x = 2,648.19 × 1,256.72
4. Step 4: Simplify right side
   1,919.50x = 3,328,024.81
5. Step 5: Solve for x
   x = 3,328,024.81/1,919.50
6. Step 6: Final answer
   x = 1,733.80