Finding the Third Proportional to 30,780.88 and 67,400.38

Step by Step Solution

1. Step 1: Write the proportion equation
   30,780.88 : 67,400.38 = 67,400.38 : x
2. Step 2: Convert to fraction form
   30,780.88/67,400.38 = 67,400.38/x
3. Step 3: Cross multiply
   30,780.88x = 67,400.38 × 67,400.38
4. Step 4: Simplify right side
   30,780.88x = 4,542,810,550.14
5. Step 5: Solve for x
   x = 4,542,810,550.14/30,780.88
6. Step 6: Final answer
   x = 147,585.49