Finding the Third Proportional to 4,222.31 and 8,991.38

Step by Step Solution

1. Step 1: Write the proportion equation
   4,222.31 : 8,991.38 = 8,991.38 : x
2. Step 2: Convert to fraction form
   4,222.31/8,991.38 = 8,991.38/x
3. Step 3: Cross multiply
   4,222.31x = 8,991.38 × 8,991.38
4. Step 4: Simplify right side
   4,222.31x = 80,844,824.39
5. Step 5: Solve for x
   x = 80,844,824.39/4,222.31
6. Step 6: Final answer
   x = 19,147.05