Finding the Third Proportional to 30,777.47 and 66,361.78

Step by Step Solution

1. Step 1: Write the proportion equation
   30,777.47 : 66,361.78 = 66,361.78 : x
2. Step 2: Convert to fraction form
   30,777.47/66,361.78 = 66,361.78/x
3. Step 3: Cross multiply
   30,777.47x = 66,361.78 × 66,361.78
4. Step 4: Simplify right side
   30,777.47x = 4,403,886,010.67
5. Step 5: Solve for x
   x = 4,403,886,010.67/30,777.47
6. Step 6: Final answer
   x = 143,087.99