Finding the Third Proportional to 12,856 and 29,870

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856 : 29,870 = 29,870 : x
2. Step 2: Convert to fraction form
   12,856/29,870 = 29,870/x
3. Step 3: Cross multiply
   12,856x = 29,870 × 29,870
4. Step 4: Simplify right side
   12,856x = 892,216,900
5. Step 5: Solve for x
   x = 892,216,900/12,856
6. Step 6: Final answer
   x = 69,400.82