Finding the Third Proportional to 310,623.50 and 665,499.50

Step by Step Solution

1. Step 1: Write the proportion equation
   310,623.50 : 665,499.50 = 665,499.50 : x
2. Step 2: Convert to fraction form
   310,623.50/665,499.50 = 665,499.50/x
3. Step 3: Cross multiply
   310,623.50x = 665,499.50 × 665,499.50
4. Step 4: Simplify right side
   310,623.50x = 442,889,584,500.25
5. Step 5: Solve for x
   x = 442,889,584,500.25/310,623.50
6. Step 6: Final answer
   x = 1,425,808.36