Finding the Third Proportional to 65,485.50 and 142,963.50

Step by Step Solution

1. Step 1: Write the proportion equation
   65,485.50 : 142,963.50 = 142,963.50 : x
2. Step 2: Convert to fraction form
   65,485.50/142,963.50 = 142,963.50/x
3. Step 3: Cross multiply
   65,485.50x = 142,963.50 × 142,963.50
4. Step 4: Simplify right side
   65,485.50x = 20,438,562,332.25
5. Step 5: Solve for x
   x = 20,438,562,332.25/65,485.50
6. Step 6: Final answer
   x = 312,108.21