Finding the Fourth Proportional to 1,298.69, 1,792.22 and 709.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.69 : 1,792.22 = 709.28 : x
2. Step 2: Convert to fraction form
   1,298.69/1,792.22 = 709.28/x
3. Step 3: Cross multiply
   1,298.69x = 1,792.22 × 709.28
4. Step 4: Simplify right side
   1,298.69x = 1,271,185.80
5. Step 5: Solve for x
   x = 1,271,185.80/1,298.69
6. Step 6: Final answer
   x = 978.82