Finding the Third Proportional to 212,199 and 288,361.50

Step by Step Solution

1. Step 1: Write the proportion equation
   212,199 : 288,361.50 = 288,361.50 : x
2. Step 2: Convert to fraction form
   212,199/288,361.50 = 288,361.50/x
3. Step 3: Cross multiply
   212,199x = 288,361.50 × 288,361.50
4. Step 4: Simplify right side
   212,199x = 83,152,354,682.25
5. Step 5: Solve for x
   x = 83,152,354,682.25/212,199
6. Step 6: Final answer
   x = 391,860.26