Finding the Third Proportional to 64,998.50 and 142,739.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,998.50 : 142,739.50 = 142,739.50 : x
2. Step 2: Convert to fraction form
   64,998.50/142,739.50 = 142,739.50/x
3. Step 3: Cross multiply
   64,998.50x = 142,739.50 × 142,739.50
4. Step 4: Simplify right side
   64,998.50x = 20,374,564,860.25
5. Step 5: Solve for x
   x = 20,374,564,860.25/64,998.50
6. Step 6: Final answer
   x = 313,462.08