Finding the Third Proportional to 7,922.81 and 12,339.21

Step by Step Solution

1. Step 1: Write the proportion equation
   7,922.81 : 12,339.21 = 12,339.21 : x
2. Step 2: Convert to fraction form
   7,922.81/12,339.21 = 12,339.21/x
3. Step 3: Cross multiply
   7,922.81x = 12,339.21 × 12,339.21
4. Step 4: Simplify right side
   7,922.81x = 152,256,126.56
5. Step 5: Solve for x
   x = 152,256,126.56/7,922.81
6. Step 6: Final answer
   x = 19,217.43