Finding the Fourth Proportional to 1,238.79, 1,709.32 and 796.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.79 : 1,709.32 = 796.61 : x
2. Step 2: Convert to fraction form
   1,238.79/1,709.32 = 796.61/x
3. Step 3: Cross multiply
   1,238.79x = 1,709.32 × 796.61
4. Step 4: Simplify right side
   1,238.79x = 1,361,661.41
5. Step 5: Solve for x
   x = 1,361,661.41/1,238.79
6. Step 6: Final answer
   x = 1,099.19