Finding the Third Proportional to 139,981.69 and 215,451.38

Step by Step Solution

1. Step 1: Write the proportion equation
   139,981.69 : 215,451.38 = 215,451.38 : x
2. Step 2: Convert to fraction form
   139,981.69/215,451.38 = 215,451.38/x
3. Step 3: Cross multiply
   139,981.69x = 215,451.38 × 215,451.38
4. Step 4: Simplify right side
   139,981.69x = 46,419,294,989.39
5. Step 5: Solve for x
   x = 46,419,294,989.39/139,981.69
6. Step 6: Final answer
   x = 331,609.77