Finding the Third Proportional to 139,679.50 and 216,238

Step by Step Solution

1. Step 1: Write the proportion equation
   139,679.50 : 216,238 = 216,238 : x
2. Step 2: Convert to fraction form
   139,679.50/216,238 = 216,238/x
3. Step 3: Cross multiply
   139,679.50x = 216,238 × 216,238
4. Step 4: Simplify right side
   139,679.50x = 46,758,872,644
5. Step 5: Solve for x
   x = 46,758,872,644/139,679.50
6. Step 6: Final answer
   x = 334,758.30