Finding the Third Proportional to 12,639 and 28,086

Step by Step Solution

1. Step 1: Write the proportion equation
   12,639 : 28,086 = 28,086 : x
2. Step 2: Convert to fraction form
   12,639/28,086 = 28,086/x
3. Step 3: Cross multiply
   12,639x = 28,086 × 28,086
4. Step 4: Simplify right side
   12,639x = 788,823,396
5. Step 5: Solve for x
   x = 788,823,396/12,639
6. Step 6: Final answer
   x = 62,411.85