Finding the Third Proportional to 67,639 and 105,143

Step by Step Solution

1. Step 1: Write the proportion equation
   67,639 : 105,143 = 105,143 : x
2. Step 2: Convert to fraction form
   67,639/105,143 = 105,143/x
3. Step 3: Cross multiply
   67,639x = 105,143 × 105,143
4. Step 4: Simplify right side
   67,639x = 11,055,050,449
5. Step 5: Solve for x
   x = 11,055,050,449/67,639
6. Step 6: Final answer
   x = 163,441.96