Finding the Third Proportional to 131,389 and 288,212.50

Step by Step Solution

1. Step 1: Write the proportion equation
   131,389 : 288,212.50 = 288,212.50 : x
2. Step 2: Convert to fraction form
   131,389/288,212.50 = 288,212.50/x
3. Step 3: Cross multiply
   131,389x = 288,212.50 × 288,212.50
4. Step 4: Simplify right side
   131,389x = 83,066,445,156.25
5. Step 5: Solve for x
   x = 83,066,445,156.25/131,389
6. Step 6: Final answer
   x = 632,217.65