Finding the Fourth Proportional to 1,919.99, 2,649.80 and 1,080.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,919.99 : 2,649.80 = 1,080.72 : x
2. Step 2: Convert to fraction form
   1,919.99/2,649.80 = 1,080.72/x
3. Step 3: Cross multiply
   1,919.99x = 2,649.80 × 1,080.72
4. Step 4: Simplify right side
   1,919.99x = 2,863,686.45
5. Step 5: Solve for x
   x = 2,863,686.45/1,919.99
6. Step 6: Final answer
   x = 1,491.52