Finding the Fourth Proportional to 2,138.77, 3,210.41 and 1,216.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,138.77 : 3,210.41 = 1,216.14 : x
2. Step 2: Convert to fraction form
   2,138.77/3,210.41 = 1,216.14/x
3. Step 3: Cross multiply
   2,138.77x = 3,210.41 × 1,216.14
4. Step 4: Simplify right side
   2,138.77x = 3,904,308.02
5. Step 5: Solve for x
   x = 3,904,308.02/2,138.77
6. Step 6: Final answer
   x = 1,825.49