Finding the Third Proportional to 210,388.50 and 318,100.50

Step by Step Solution

1. Step 1: Write the proportion equation
   210,388.50 : 318,100.50 = 318,100.50 : x
2. Step 2: Convert to fraction form
   210,388.50/318,100.50 = 318,100.50/x
3. Step 3: Cross multiply
   210,388.50x = 318,100.50 × 318,100.50
4. Step 4: Simplify right side
   210,388.50x = 101,187,928,100.25
5. Step 5: Solve for x
   x = 101,187,928,100.25/210,388.50
6. Step 6: Final answer
   x = 480,957.51