Finding the Fourth Proportional to 2,211.90, 3,315.47 and 1,040.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.90 : 3,315.47 = 1,040.91 : x
2. Step 2: Convert to fraction form
   2,211.90/3,315.47 = 1,040.91/x
3. Step 3: Cross multiply
   2,211.90x = 3,315.47 × 1,040.91
4. Step 4: Simplify right side
   2,211.90x = 3,451,105.88
5. Step 5: Solve for x
   x = 3,451,105.88/2,211.90
6. Step 6: Final answer
   x = 1,560.24