Finding the Third Proportional to 67,920.75 and 149,287.50

Step by Step Solution

1. Step 1: Write the proportion equation
   67,920.75 : 149,287.50 = 149,287.50 : x
2. Step 2: Convert to fraction form
   67,920.75/149,287.50 = 149,287.50/x
3. Step 3: Cross multiply
   67,920.75x = 149,287.50 × 149,287.50
4. Step 4: Simplify right side
   67,920.75x = 22,286,757,656.25
5. Step 5: Solve for x
   x = 22,286,757,656.25/67,920.75
6. Step 6: Final answer
   x = 328,128.85