Finding the Fourth Proportional to 22,778.89, 34,168.56 and 7,988.17

Step by Step Solution

1. Step 1: Write the proportion equation
   22,778.89 : 34,168.56 = 7,988.17 : x
2. Step 2: Convert to fraction form
   22,778.89/34,168.56 = 7,988.17/x
3. Step 3: Cross multiply
   22,778.89x = 34,168.56 × 7,988.17
4. Step 4: Simplify right side
   22,778.89x = 272,944,265.94
5. Step 5: Solve for x
   x = 272,944,265.94/22,778.89
6. Step 6: Final answer
   x = 11,982.33