Finding the Third Proportional to 435,438 and 640,345.50

Step by Step Solution

1. Step 1: Write the proportion equation
   435,438 : 640,345.50 = 640,345.50 : x
2. Step 2: Convert to fraction form
   435,438/640,345.50 = 640,345.50/x
3. Step 3: Cross multiply
   435,438x = 640,345.50 × 640,345.50
4. Step 4: Simplify right side
   435,438x = 410,042,359,370.25
5. Step 5: Solve for x
   x = 410,042,359,370.25/435,438
6. Step 6: Final answer
   x = 941,677.94