Finding the Third Proportional to 12,900 and 19,798

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900 : 19,798 = 19,798 : x
2. Step 2: Convert to fraction form
   12,900/19,798 = 19,798/x
3. Step 3: Cross multiply
   12,900x = 19,798 × 19,798
4. Step 4: Simplify right side
   12,900x = 391,960,804
5. Step 5: Solve for x
   x = 391,960,804/12,900
6. Step 6: Final answer
   x = 30,384.56