Finding the Fourth Proportional to 656,870.25, 906,480.55 and 355,064.25

Step by Step Solution

1. Step 1: Write the proportion equation
   656,870.25 : 906,480.55 = 355,064.25 : x
2. Step 2: Convert to fraction form
   656,870.25/906,480.55 = 355,064.25/x
3. Step 3: Cross multiply
   656,870.25x = 906,480.55 × 355,064.25
4. Step 4: Simplify right side
   656,870.25x = 321,858,836,625.34
5. Step 5: Solve for x
   x = 321,858,836,625.34/656,870.25
6. Step 6: Final answer
   x = 489,988.45