Finding the Third Proportional to 310,356 and 665,005.50

Step by Step Solution

1. Step 1: Write the proportion equation
   310,356 : 665,005.50 = 665,005.50 : x
2. Step 2: Convert to fraction form
   310,356/665,005.50 = 665,005.50/x
3. Step 3: Cross multiply
   310,356x = 665,005.50 × 665,005.50
4. Step 4: Simplify right side
   310,356x = 442,232,315,030.25
5. Step 5: Solve for x
   x = 442,232,315,030.25/310,356
6. Step 6: Final answer
   x = 1,424,919.50