Finding the Fourth Proportional to 1,919.15, 2,648.23 and 1,079.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,919.15 : 2,648.23 = 1,079.72 : x
2. Step 2: Convert to fraction form
   1,919.15/2,648.23 = 1,079.72/x
3. Step 3: Cross multiply
   1,919.15x = 2,648.23 × 1,079.72
4. Step 4: Simplify right side
   1,919.15x = 2,859,346.90
5. Step 5: Solve for x
   x = 2,859,346.90/1,919.15
6. Step 6: Final answer
   x = 1,489.90