Finding the Third Proportional to 12,870 and 28,107

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870 : 28,107 = 28,107 : x
2. Step 2: Convert to fraction form
   12,870/28,107 = 28,107/x
3. Step 3: Cross multiply
   12,870x = 28,107 × 28,107
4. Step 4: Simplify right side
   12,870x = 790,003,449
5. Step 5: Solve for x
   x = 790,003,449/12,870
6. Step 6: Final answer
   x = 61,383.33