Finding the Fourth Proportional to 2,353.90, 3,531.78 and 1,121.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,353.90 : 3,531.78 = 1,121.86 : x
2. Step 2: Convert to fraction form
   2,353.90/3,531.78 = 1,121.86/x
3. Step 3: Cross multiply
   2,353.90x = 3,531.78 × 1,121.86
4. Step 4: Simplify right side
   2,353.90x = 3,962,162.71
5. Step 5: Solve for x
   x = 3,962,162.71/2,353.90
6. Step 6: Final answer
   x = 1,683.23