Finding the Third Proportional to 4,847.72 and 7,777.78

Step by Step Solution

1. Step 1: Write the proportion equation
   4,847.72 : 7,777.78 = 7,777.78 : x
2. Step 2: Convert to fraction form
   4,847.72/7,777.78 = 7,777.78/x
3. Step 3: Cross multiply
   4,847.72x = 7,777.78 × 7,777.78
4. Step 4: Simplify right side
   4,847.72x = 60,493,881.17
5. Step 5: Solve for x
   x = 60,493,881.17/4,847.72
6. Step 6: Final answer
   x = 12,478.83