Finding the Third Proportional to 139,639.50 and 215,777.25

Step by Step Solution

1. Step 1: Write the proportion equation
   139,639.50 : 215,777.25 = 215,777.25 : x
2. Step 2: Convert to fraction form
   139,639.50/215,777.25 = 215,777.25/x
3. Step 3: Cross multiply
   139,639.50x = 215,777.25 × 215,777.25
4. Step 4: Simplify right side
   139,639.50x = 46,559,821,617.56
5. Step 5: Solve for x
   x = 46,559,821,617.56/139,639.50
6. Step 6: Final answer
   x = 333,428.73