Finding the Fourth Proportional to 2,990.45, 4,481.98 and 1,040.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,990.45 : 4,481.98 = 1,040.38 : x
2. Step 2: Convert to fraction form
   2,990.45/4,481.98 = 1,040.38/x
3. Step 3: Cross multiply
   2,990.45x = 4,481.98 × 1,040.38
4. Step 4: Simplify right side
   2,990.45x = 4,662,962.35
5. Step 5: Solve for x
   x = 4,662,962.35/2,990.45
6. Step 6: Final answer
   x = 1,559.28