Finding the Fourth Proportional to 2,137.69, 3,201.06 and 1,211.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,137.69 : 3,201.06 = 1,211.86 : x
2. Step 2: Convert to fraction form
   2,137.69/3,201.06 = 1,211.86/x
3. Step 3: Cross multiply
   2,137.69x = 3,201.06 × 1,211.86
4. Step 4: Simplify right side
   2,137.69x = 3,879,236.57
5. Step 5: Solve for x
   x = 3,879,236.57/2,137.69
6. Step 6: Final answer
   x = 1,814.69