Finding the Fourth Proportional to 664,429.80, 995,456.70 and 404,293.80

Step by Step Solution

1. Step 1: Write the proportion equation
   664,429.80 : 995,456.70 = 404,293.80 : x
2. Step 2: Convert to fraction form
   664,429.80/995,456.70 = 404,293.80/x
3. Step 3: Cross multiply
   664,429.80x = 995,456.70 × 404,293.80
4. Step 4: Simplify right side
   664,429.80x = 402,456,971,978.46
5. Step 5: Solve for x
   x = 402,456,971,978.46/664,429.80
6. Step 6: Final answer
   x = 605,717.82