Finding the Third Proportional to 12,778 and 13,930

Step by Step Solution

1. Step 1: Write the proportion equation
   12,778 : 13,930 = 13,930 : x
2. Step 2: Convert to fraction form
   12,778/13,930 = 13,930/x
3. Step 3: Cross multiply
   12,778x = 13,930 × 13,930
4. Step 4: Simplify right side
   12,778x = 194,044,900
5. Step 5: Solve for x
   x = 194,044,900/12,778
6. Step 6: Final answer
   x = 15,185.86