Finding the Third Proportional to 321,672.09 and 428,847.33

Step by Step Solution

1. Step 1: Write the proportion equation
   321,672.09 : 428,847.33 = 428,847.33 : x
2. Step 2: Convert to fraction form
   321,672.09/428,847.33 = 428,847.33/x
3. Step 3: Cross multiply
   321,672.09x = 428,847.33 × 428,847.33
4. Step 4: Simplify right side
   321,672.09x = 183,910,030,839.95
5. Step 5: Solve for x
   x = 183,910,030,839.95/321,672.09
6. Step 6: Final answer
   x = 571,731.38