Finding the Third Proportional to 139,408.50 and 216,169.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,408.50 : 216,169.50 = 216,169.50 : x
2. Step 2: Convert to fraction form
   139,408.50/216,169.50 = 216,169.50/x
3. Step 3: Cross multiply
   139,408.50x = 216,169.50 × 216,169.50
4. Step 4: Simplify right side
   139,408.50x = 46,729,252,730.25
5. Step 5: Solve for x
   x = 46,729,252,730.25/139,408.50
6. Step 6: Final answer
   x = 335,196.58