Finding the Third Proportional to 328,671 and 469,678.50

Step by Step Solution

1. Step 1: Write the proportion equation
   328,671 : 469,678.50 = 469,678.50 : x
2. Step 2: Convert to fraction form
   328,671/469,678.50 = 469,678.50/x
3. Step 3: Cross multiply
   328,671x = 469,678.50 × 469,678.50
4. Step 4: Simplify right side
   328,671x = 220,597,893,362.25
5. Step 5: Solve for x
   x = 220,597,893,362.25/328,671
6. Step 6: Final answer
   x = 671,181.50