Finding the Fourth Proportional to 640,662.32, 961,335.72 and 415,969.52

Step by Step Solution

1. Step 1: Write the proportion equation
   640,662.32 : 961,335.72 = 415,969.52 : x
2. Step 2: Convert to fraction form
   640,662.32/961,335.72 = 415,969.52/x
3. Step 3: Cross multiply
   640,662.32x = 961,335.72 × 415,969.52
4. Step 4: Simplify right side
   640,662.32x = 399,886,358,007.25
5. Step 5: Solve for x
   x = 399,886,358,007.25/640,662.32
6. Step 6: Final answer
   x = 624,176.49