Finding the Third Proportional to 12,878 and 27,139

Step by Step Solution

1. Step 1: Write the proportion equation
   12,878 : 27,139 = 27,139 : x
2. Step 2: Convert to fraction form
   12,878/27,139 = 27,139/x
3. Step 3: Cross multiply
   12,878x = 27,139 × 27,139
4. Step 4: Simplify right side
   12,878x = 736,525,321
5. Step 5: Solve for x
   x = 736,525,321/12,878
6. Step 6: Final answer
   x = 57,192.52