Finding the Fourth Proportional to 1,920.15, 2,649.74 and 1,080.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,920.15 : 2,649.74 = 1,080.89 : x
2. Step 2: Convert to fraction form
   1,920.15/2,649.74 = 1,080.89/x
3. Step 3: Cross multiply
   1,920.15x = 2,649.74 × 1,080.89
4. Step 4: Simplify right side
   1,920.15x = 2,864,058.82
5. Step 5: Solve for x
   x = 2,864,058.82/1,920.15
6. Step 6: Final answer
   x = 1,491.58