Finding the Third Proportional to 213,981.75 and 331,155

Step by Step Solution

1. Step 1: Write the proportion equation
   213,981.75 : 331,155 = 331,155 : x
2. Step 2: Convert to fraction form
   213,981.75/331,155 = 331,155/x
3. Step 3: Cross multiply
   213,981.75x = 331,155 × 331,155
4. Step 4: Simplify right side
   213,981.75x = 109,663,634,025
5. Step 5: Solve for x
   x = 109,663,634,025/213,981.75
6. Step 6: Final answer
   x = 512,490.59