Finding the Third Proportional to 12,870 and 29,781

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870 : 29,781 = 29,781 : x
2. Step 2: Convert to fraction form
   12,870/29,781 = 29,781/x
3. Step 3: Cross multiply
   12,870x = 29,781 × 29,781
4. Step 4: Simplify right side
   12,870x = 886,907,961
5. Step 5: Solve for x
   x = 886,907,961/12,870
6. Step 6: Final answer
   x = 68,912.82