Finding the Fourth Proportional to 1,919.48, 2,648.89 and 1,080.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,919.48 : 2,648.89 = 1,080.17 : x
2. Step 2: Convert to fraction form
   1,919.48/2,648.89 = 1,080.17/x
3. Step 3: Cross multiply
   1,919.48x = 2,648.89 × 1,080.17
4. Step 4: Simplify right side
   1,919.48x = 2,861,251.51
5. Step 5: Solve for x
   x = 2,861,251.51/1,919.48
6. Step 6: Final answer
   x = 1,490.64