Finding the Fourth Proportional to 22,786.38, 34,166.81 and 7,989.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,786.38 : 34,166.81 = 7,989.50 : x
2. Step 2: Convert to fraction form
   22,786.38/34,166.81 = 7,989.50/x
3. Step 3: Cross multiply
   22,786.38x = 34,166.81 × 7,989.50
4. Step 4: Simplify right side
   22,786.38x = 272,975,833.89
5. Step 5: Solve for x
   x = 272,975,833.89/22,786.38
6. Step 6: Final answer
   x = 11,979.78