Finding the Third Proportional to 260,015 and 388,321.50

Step by Step Solution

1. Step 1: Write the proportion equation
   260,015 : 388,321.50 = 388,321.50 : x
2. Step 2: Convert to fraction form
   260,015/388,321.50 = 388,321.50/x
3. Step 3: Cross multiply
   260,015x = 388,321.50 × 388,321.50
4. Step 4: Simplify right side
   260,015x = 150,793,587,362.25
5. Step 5: Solve for x
   x = 150,793,587,362.25/260,015
6. Step 6: Final answer
   x = 579,941.88