Finding the Third Proportional to 68,760.50 and 144,987.50

Step by Step Solution

1. Step 1: Write the proportion equation
   68,760.50 : 144,987.50 = 144,987.50 : x
2. Step 2: Convert to fraction form
   68,760.50/144,987.50 = 144,987.50/x
3. Step 3: Cross multiply
   68,760.50x = 144,987.50 × 144,987.50
4. Step 4: Simplify right side
   68,760.50x = 21,021,375,156.25
5. Step 5: Solve for x
   x = 21,021,375,156.25/68,760.50
6. Step 6: Final answer
   x = 305,718.77