Finding the Third Proportional to 139,749 and 217,924.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,749 : 217,924.50 = 217,924.50 : x
2. Step 2: Convert to fraction form
   139,749/217,924.50 = 217,924.50/x
3. Step 3: Cross multiply
   139,749x = 217,924.50 × 217,924.50
4. Step 4: Simplify right side
   139,749x = 47,491,087,700.25
5. Step 5: Solve for x
   x = 47,491,087,700.25/139,749
6. Step 6: Final answer
   x = 339,831.32