Finding the Third Proportional to 151,406.50 and 318,495.50

Step by Step Solution

1. Step 1: Write the proportion equation
   151,406.50 : 318,495.50 = 318,495.50 : x
2. Step 2: Convert to fraction form
   151,406.50/318,495.50 = 318,495.50/x
3. Step 3: Cross multiply
   151,406.50x = 318,495.50 × 318,495.50
4. Step 4: Simplify right side
   151,406.50x = 101,439,383,520.25
5. Step 5: Solve for x
   x = 101,439,383,520.25/151,406.50
6. Step 6: Final answer
   x = 669,980.37