Finding the Fourth Proportional to 5,411.78, 8,112.77 and 2,123.99

Step by Step Solution

1. Step 1: Write the proportion equation
   5,411.78 : 8,112.77 = 2,123.99 : x
2. Step 2: Convert to fraction form
   5,411.78/8,112.77 = 2,123.99/x
3. Step 3: Cross multiply
   5,411.78x = 8,112.77 × 2,123.99
4. Step 4: Simplify right side
   5,411.78x = 17,231,391.17
5. Step 5: Solve for x
   x = 17,231,391.17/5,411.78
6. Step 6: Final answer
   x = 3,184.06