Finding the Third Proportional to 34,239.38 and 69,420.38

Step by Step Solution

1. Step 1: Write the proportion equation
   34,239.38 : 69,420.38 = 69,420.38 : x
2. Step 2: Convert to fraction form
   34,239.38/69,420.38 = 69,420.38/x
3. Step 3: Cross multiply
   34,239.38x = 69,420.38 × 69,420.38
4. Step 4: Simplify right side
   34,239.38x = 4,819,188,465.14
5. Step 5: Solve for x
   x = 4,819,188,465.14/34,239.38
6. Step 6: Final answer
   x = 140,749.90