Finding the Third Proportional to 30,989.75 and 67,818.25

Step by Step Solution

1. Step 1: Write the proportion equation
   30,989.75 : 67,818.25 = 67,818.25 : x
2. Step 2: Convert to fraction form
   30,989.75/67,818.25 = 67,818.25/x
3. Step 3: Cross multiply
   30,989.75x = 67,818.25 × 67,818.25
4. Step 4: Simplify right side
   30,989.75x = 4,599,315,033.06
5. Step 5: Solve for x
   x = 4,599,315,033.06/30,989.75
6. Step 6: Final answer
   x = 148,414.07