Finding the Third Proportional to 12,920.63 and 19,942.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,920.63 : 19,942.88 = 19,942.88 : x
2. Step 2: Convert to fraction form
   12,920.63/19,942.88 = 19,942.88/x
3. Step 3: Cross multiply
   12,920.63x = 19,942.88 × 19,942.88
4. Step 4: Simplify right side
   12,920.63x = 397,718,263.27
5. Step 5: Solve for x
   x = 397,718,263.27/12,920.63
6. Step 6: Final answer
   x = 30,781.66