Finding the Fourth Proportional to 1,082.21, 1,493.57 and 709.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,082.21 : 1,493.57 = 709.28 : x
2. Step 2: Convert to fraction form
   1,082.21/1,493.57 = 709.28/x
3. Step 3: Cross multiply
   1,082.21x = 1,493.57 × 709.28
4. Step 4: Simplify right side
   1,082.21x = 1,059,359.33
5. Step 5: Solve for x
   x = 1,059,359.33/1,082.21
6. Step 6: Final answer
   x = 978.89