Finding the Third Proportional to 30,559.78 and 64,438.03

Step by Step Solution

1. Step 1: Write the proportion equation
   30,559.78 : 64,438.03 = 64,438.03 : x
2. Step 2: Convert to fraction form
   30,559.78/64,438.03 = 64,438.03/x
3. Step 3: Cross multiply
   30,559.78x = 64,438.03 × 64,438.03
4. Step 4: Simplify right side
   30,559.78x = 4,152,259,871.38
5. Step 5: Solve for x
   x = 4,152,259,871.38/30,559.78
6. Step 6: Final answer
   x = 135,873.35