Finding the Fourth Proportional to 1,081.05, 1,491.89 and 709.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.05 : 1,491.89 = 709.01 : x
2. Step 2: Convert to fraction form
   1,081.05/1,491.89 = 709.01/x
3. Step 3: Cross multiply
   1,081.05x = 1,491.89 × 709.01
4. Step 4: Simplify right side
   1,081.05x = 1,057,759.52
5. Step 5: Solve for x
   x = 1,057,759.52/1,081.05
6. Step 6: Final answer
   x = 978.45