Finding the Third Proportional to 30,638.25 and 67,290.75

Step by Step Solution

1. Step 1: Write the proportion equation
   30,638.25 : 67,290.75 = 67,290.75 : x
2. Step 2: Convert to fraction form
   30,638.25/67,290.75 = 67,290.75/x
3. Step 3: Cross multiply
   30,638.25x = 67,290.75 × 67,290.75
4. Step 4: Simplify right side
   30,638.25x = 4,528,045,035.56
5. Step 5: Solve for x
   x = 4,528,045,035.56/30,638.25
6. Step 6: Final answer
   x = 147,790.59