Finding the Third Proportional to 40,778 and 64,878

Step by Step Solution

1. Step 1: Write the proportion equation
   40,778 : 64,878 = 64,878 : x
2. Step 2: Convert to fraction form
   40,778/64,878 = 64,878/x
3. Step 3: Cross multiply
   40,778x = 64,878 × 64,878
4. Step 4: Simplify right side
   40,778x = 4,209,154,884
5. Step 5: Solve for x
   x = 4,209,154,884/40,778
6. Step 6: Final answer
   x = 103,221.22