Finding the Third Proportional to 67,579.50 and 139,443

Step by Step Solution

1. Step 1: Write the proportion equation
   67,579.50 : 139,443 = 139,443 : x
2. Step 2: Convert to fraction form
   67,579.50/139,443 = 139,443/x
3. Step 3: Cross multiply
   67,579.50x = 139,443 × 139,443
4. Step 4: Simplify right side
   67,579.50x = 19,444,350,249
5. Step 5: Solve for x
   x = 19,444,350,249/67,579.50
6. Step 6: Final answer
   x = 287,725.57