Finding the Third Proportional to 131,389 and 288,212

Step by Step Solution

1. Step 1: Write the proportion equation
   131,389 : 288,212 = 288,212 : x
2. Step 2: Convert to fraction form
   131,389/288,212 = 288,212/x
3. Step 3: Cross multiply
   131,389x = 288,212 × 288,212
4. Step 4: Simplify right side
   131,389x = 83,066,156,944
5. Step 5: Solve for x
   x = 83,066,156,944/131,389
6. Step 6: Final answer
   x = 632,215.46