Finding the Third Proportional to 12,778 and 28,015

Step by Step Solution

1. Step 1: Write the proportion equation
   12,778 : 28,015 = 28,015 : x
2. Step 2: Convert to fraction form
   12,778/28,015 = 28,015/x
3. Step 3: Cross multiply
   12,778x = 28,015 × 28,015
4. Step 4: Simplify right side
   12,778x = 784,840,225
5. Step 5: Solve for x
   x = 784,840,225/12,778
6. Step 6: Final answer
   x = 61,421.21