Finding the Fourth Proportional to 3,540.82, 5,311.32 and 1,990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,540.82 : 5,311.32 = 1,990.72 : x
2. Step 2: Convert to fraction form
   3,540.82/5,311.32 = 1,990.72/x
3. Step 3: Cross multiply
   3,540.82x = 5,311.32 × 1,990.72
4. Step 4: Simplify right side
   3,540.82x = 10,573,350.95
5. Step 5: Solve for x
   x = 10,573,350.95/3,540.82
6. Step 6: Final answer
   x = 2,986.13