Finding the Third Proportional to 12,946.71 and 19,992.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,946.71 : 19,992.45 = 19,992.45 : x
2. Step 2: Convert to fraction form
   12,946.71/19,992.45 = 19,992.45/x
3. Step 3: Cross multiply
   12,946.71x = 19,992.45 × 19,992.45
4. Step 4: Simplify right side
   12,946.71x = 399,697,869.57
5. Step 5: Solve for x
   x = 399,697,869.57/12,946.71
6. Step 6: Final answer
   x = 30,872.54