Finding the Fourth Proportional to 1,709.91, 2,359.62 and 1,080.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,709.91 : 2,359.62 = 1,080.78 : x
2. Step 2: Convert to fraction form
   1,709.91/2,359.62 = 1,080.78/x
3. Step 3: Cross multiply
   1,709.91x = 2,359.62 × 1,080.78
4. Step 4: Simplify right side
   1,709.91x = 2,550,230.10
5. Step 5: Solve for x
   x = 2,550,230.10/1,709.91
6. Step 6: Final answer
   x = 1,491.44