Finding the Fourth Proportional to 1,709.40, 2,358.18 and 1,080.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,709.40 : 2,358.18 = 1,080.72 : x
2. Step 2: Convert to fraction form
   1,709.40/2,358.18 = 1,080.72/x
3. Step 3: Cross multiply
   1,709.40x = 2,358.18 × 1,080.72
4. Step 4: Simplify right side
   1,709.40x = 2,548,532.29
5. Step 5: Solve for x
   x = 2,548,532.29/1,709.40
6. Step 6: Final answer
   x = 1,490.89