Finding the Fourth Proportional to 1,298.86, 1,792.43 and 709.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.86 : 1,792.43 = 709.39 : x
2. Step 2: Convert to fraction form
   1,298.86/1,792.43 = 709.39/x
3. Step 3: Cross multiply
   1,298.86x = 1,792.43 × 709.39
4. Step 4: Simplify right side
   1,298.86x = 1,271,531.92
5. Step 5: Solve for x
   x = 1,271,531.92/1,298.86
6. Step 6: Final answer
   x = 978.96