Finding the Third Proportional to 12,436 and 19,878

Step by Step Solution

1. Step 1: Write the proportion equation
   12,436 : 19,878 = 19,878 : x
2. Step 2: Convert to fraction form
   12,436/19,878 = 19,878/x
3. Step 3: Cross multiply
   12,436x = 19,878 × 19,878
4. Step 4: Simplify right side
   12,436x = 395,134,884
5. Step 5: Solve for x
   x = 395,134,884/12,436
6. Step 6: Final answer
   x = 31,773.47