Finding the Fourth Proportional to 2,196.70, 3,294.98 and 879.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.70 : 3,294.98 = 879.80 : x
2. Step 2: Convert to fraction form
   2,196.70/3,294.98 = 879.80/x
3. Step 3: Cross multiply
   2,196.70x = 3,294.98 × 879.80
4. Step 4: Simplify right side
   2,196.70x = 2,898,923.40
5. Step 5: Solve for x
   x = 2,898,923.40/2,196.70
6. Step 6: Final answer
   x = 1,319.67