Finding the Third Proportional to 258,601.50 and 388,215

Step by Step Solution

1. Step 1: Write the proportion equation
   258,601.50 : 388,215 = 388,215 : x
2. Step 2: Convert to fraction form
   258,601.50/388,215 = 388,215/x
3. Step 3: Cross multiply
   258,601.50x = 388,215 × 388,215
4. Step 4: Simplify right side
   258,601.50x = 150,710,886,225
5. Step 5: Solve for x
   x = 150,710,886,225/258,601.50
6. Step 6: Final answer
   x = 582,792.00