Finding the Third Proportional to 12,488 and 19,490

Step by Step Solution

1. Step 1: Write the proportion equation
   12,488 : 19,490 = 19,490 : x
2. Step 2: Convert to fraction form
   12,488/19,490 = 19,490/x
3. Step 3: Cross multiply
   12,488x = 19,490 × 19,490
4. Step 4: Simplify right side
   12,488x = 379,860,100
5. Step 5: Solve for x
   x = 379,860,100/12,488
6. Step 6: Final answer
   x = 30,418.01