Finding the Third Proportional to 15,878 and 25,131

Step by Step Solution

1. Step 1: Write the proportion equation
   15,878 : 25,131 = 25,131 : x
2. Step 2: Convert to fraction form
   15,878/25,131 = 25,131/x
3. Step 3: Cross multiply
   15,878x = 25,131 × 25,131
4. Step 4: Simplify right side
   15,878x = 631,567,161
5. Step 5: Solve for x
   x = 631,567,161/15,878
6. Step 6: Final answer
   x = 39,776.24