Finding the Third Proportional to 423,819 and 640,048.50

Step by Step Solution

1. Step 1: Write the proportion equation
   423,819 : 640,048.50 = 640,048.50 : x
2. Step 2: Convert to fraction form
   423,819/640,048.50 = 640,048.50/x
3. Step 3: Cross multiply
   423,819x = 640,048.50 × 640,048.50
4. Step 4: Simplify right side
   423,819x = 409,662,082,352.25
5. Step 5: Solve for x
   x = 409,662,082,352.25/423,819
6. Step 6: Final answer
   x = 966,596.78