Finding the Third Proportional to 30,800.25 and 67,128.75

Step by Step Solution

1. Step 1: Write the proportion equation
   30,800.25 : 67,128.75 = 67,128.75 : x
2. Step 2: Convert to fraction form
   30,800.25/67,128.75 = 67,128.75/x
3. Step 3: Cross multiply
   30,800.25x = 67,128.75 × 67,128.75
4. Step 4: Simplify right side
   30,800.25x = 4,506,269,076.56
5. Step 5: Solve for x
   x = 4,506,269,076.56/30,800.25
6. Step 6: Final answer
   x = 146,306.25