Finding the Third Proportional to 121,807.50 and 268,218

Step by Step Solution

1. Step 1: Write the proportion equation
   121,807.50 : 268,218 = 268,218 : x
2. Step 2: Convert to fraction form
   121,807.50/268,218 = 268,218/x
3. Step 3: Cross multiply
   121,807.50x = 268,218 × 268,218
4. Step 4: Simplify right side
   121,807.50x = 71,940,895,524
5. Step 5: Solve for x
   x = 71,940,895,524/121,807.50
6. Step 6: Final answer
   x = 590,611.38