Finding the Third Proportional to 326,091.50 and 428,808.50

Step by Step Solution

1. Step 1: Write the proportion equation
   326,091.50 : 428,808.50 = 428,808.50 : x
2. Step 2: Convert to fraction form
   326,091.50/428,808.50 = 428,808.50/x
3. Step 3: Cross multiply
   326,091.50x = 428,808.50 × 428,808.50
4. Step 4: Simplify right side
   326,091.50x = 183,876,729,672.25
5. Step 5: Solve for x
   x = 183,876,729,672.25/326,091.50
6. Step 6: Final answer
   x = 563,880.78