Finding the Third Proportional to 155,511 and 326,686.50

Step by Step Solution

1. Step 1: Write the proportion equation
   155,511 : 326,686.50 = 326,686.50 : x
2. Step 2: Convert to fraction form
   155,511/326,686.50 = 326,686.50/x
3. Step 3: Cross multiply
   155,511x = 326,686.50 × 326,686.50
4. Step 4: Simplify right side
   155,511x = 106,724,069,282.25
5. Step 5: Solve for x
   x = 106,724,069,282.25/155,511
6. Step 6: Final answer
   x = 686,279.87