Finding the Fourth Proportional to 2,134.69, 3,187.81 and 2,111.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,134.69 : 3,187.81 = 2,111.80 : x
2. Step 2: Convert to fraction form
   2,134.69/3,187.81 = 2,111.80/x
3. Step 3: Cross multiply
   2,134.69x = 3,187.81 × 2,111.80
4. Step 4: Simplify right side
   2,134.69x = 6,732,017.16
5. Step 5: Solve for x
   x = 6,732,017.16/2,134.69
6. Step 6: Final answer
   x = 3,153.63