Finding the Third Proportional to 12,870 and 19,440

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870 : 19,440 = 19,440 : x
2. Step 2: Convert to fraction form
   12,870/19,440 = 19,440/x
3. Step 3: Cross multiply
   12,870x = 19,440 × 19,440
4. Step 4: Simplify right side
   12,870x = 377,913,600
5. Step 5: Solve for x
   x = 377,913,600/12,870
6. Step 6: Final answer
   x = 29,363.92