Finding the Third Proportional to 12,078 and 15,912

Step by Step Solution

1. Step 1: Write the proportion equation
   12,078 : 15,912 = 15,912 : x
2. Step 2: Convert to fraction form
   12,078/15,912 = 15,912/x
3. Step 3: Cross multiply
   12,078x = 15,912 × 15,912
4. Step 4: Simplify right side
   12,078x = 253,191,744
5. Step 5: Solve for x
   x = 253,191,744/12,078
6. Step 6: Final answer
   x = 20,963.05