Finding the Fourth Proportional to 1,298.84, 1,792.40 and 709.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.84 : 1,792.40 = 709.36 : x
2. Step 2: Convert to fraction form
   1,298.84/1,792.40 = 709.36/x
3. Step 3: Cross multiply
   1,298.84x = 1,792.40 × 709.36
4. Step 4: Simplify right side
   1,298.84x = 1,271,456.86
5. Step 5: Solve for x
   x = 1,271,456.86/1,298.84
6. Step 6: Final answer
   x = 978.92