Finding the Third Proportional to 328,685 and 469,699.50

Step by Step Solution

1. Step 1: Write the proportion equation
   328,685 : 469,699.50 = 469,699.50 : x
2. Step 2: Convert to fraction form
   328,685/469,699.50 = 469,699.50/x
3. Step 3: Cross multiply
   328,685x = 469,699.50 × 469,699.50
4. Step 4: Simplify right side
   328,685x = 220,617,620,300.25
5. Step 5: Solve for x
   x = 220,617,620,300.25/328,685
6. Step 6: Final answer
   x = 671,212.93