Finding the Third Proportional to 12,913.17 and 19,869.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,913.17 : 19,869.05 = 19,869.05 : x
2. Step 2: Convert to fraction form
   12,913.17/19,869.05 = 19,869.05/x
3. Step 3: Cross multiply
   12,913.17x = 19,869.05 × 19,869.05
4. Step 4: Simplify right side
   12,913.17x = 394,779,023.72
5. Step 5: Solve for x
   x = 394,779,023.72/12,913.17
6. Step 6: Final answer
   x = 30,571.81