Finding the Third Proportional to 317,724 and 698,416.50

Step by Step Solution

1. Step 1: Write the proportion equation
   317,724 : 698,416.50 = 698,416.50 : x
2. Step 2: Convert to fraction form
   317,724/698,416.50 = 698,416.50/x
3. Step 3: Cross multiply
   317,724x = 698,416.50 × 698,416.50
4. Step 4: Simplify right side
   317,724x = 487,785,607,472.25
5. Step 5: Solve for x
   x = 487,785,607,472.25/317,724
6. Step 6: Final answer
   x = 1,535,249.49