Finding the Third Proportional to 13,198.89 and 20,439.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,198.89 : 20,439.05 = 20,439.05 : x
2. Step 2: Convert to fraction form
   13,198.89/20,439.05 = 20,439.05/x
3. Step 3: Cross multiply
   13,198.89x = 20,439.05 × 20,439.05
4. Step 4: Simplify right side
   13,198.89x = 417,754,876.68
5. Step 5: Solve for x
   x = 417,754,876.68/13,198.89
6. Step 6: Final answer
   x = 31,650.77