Finding the Fourth Proportional to 1,298.88, 1,792.46 and 709.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.88 : 1,792.46 = 709.41 : x
2. Step 2: Convert to fraction form
   1,298.88/1,792.46 = 709.41/x
3. Step 3: Cross multiply
   1,298.88x = 1,792.46 × 709.41
4. Step 4: Simplify right side
   1,298.88x = 1,271,589.05
5. Step 5: Solve for x
   x = 1,271,589.05/1,298.88
6. Step 6: Final answer
   x = 978.99