Finding the Third Proportional to 302,857.50 and 441,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   302,857.50 : 441,139.50 = 441,139.50 : x
2. Step 2: Convert to fraction form
   302,857.50/441,139.50 = 441,139.50/x
3. Step 3: Cross multiply
   302,857.50x = 441,139.50 × 441,139.50
4. Step 4: Simplify right side
   302,857.50x = 194,604,058,460.25
5. Step 5: Solve for x
   x = 194,604,058,460.25/302,857.50
6. Step 6: Final answer
   x = 642,559.81