Finding the Fourth Proportional to 8,780.40, 12,116.88 and 5,197.82

Step by Step Solution

1. Step 1: Write the proportion equation
   8,780.40 : 12,116.88 = 5,197.82 : x
2. Step 2: Convert to fraction form
   8,780.40/12,116.88 = 5,197.82/x
3. Step 3: Cross multiply
   8,780.40x = 12,116.88 × 5,197.82
4. Step 4: Simplify right side
   8,780.40x = 62,981,300.62
5. Step 5: Solve for x
   x = 62,981,300.62/8,780.40
6. Step 6: Final answer
   x = 7,172.94