Finding the Fourth Proportional to 2,990.39, 4,485.61 and 910.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,990.39 : 4,485.61 = 910.41 : x
2. Step 2: Convert to fraction form
   2,990.39/4,485.61 = 910.41/x
3. Step 3: Cross multiply
   2,990.39x = 4,485.61 × 910.41
4. Step 4: Simplify right side
   2,990.39x = 4,083,728.52
5. Step 5: Solve for x
   x = 4,083,728.52/2,990.39
6. Step 6: Final answer
   x = 1,365.62