Finding the Third Proportional to 435,419.50 and 640,326

Step by Step Solution

1. Step 1: Write the proportion equation
   435,419.50 : 640,326 = 640,326 : x
2. Step 2: Convert to fraction form
   435,419.50/640,326 = 640,326/x
3. Step 3: Cross multiply
   435,419.50x = 640,326 × 640,326
4. Step 4: Simplify right side
   435,419.50x = 410,017,386,276
5. Step 5: Solve for x
   x = 410,017,386,276/435,419.50
6. Step 6: Final answer
   x = 941,660.60