Finding the Fourth Proportional to 3,892.31, 5,371.41 and 2,123.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,892.31 : 5,371.41 = 2,123.87 : x
2. Step 2: Convert to fraction form
   3,892.31/5,371.41 = 2,123.87/x
3. Step 3: Cross multiply
   3,892.31x = 5,371.41 × 2,123.87
4. Step 4: Simplify right side
   3,892.31x = 11,408,176.56
5. Step 5: Solve for x
   x = 11,408,176.56/3,892.31
6. Step 6: Final answer
   x = 2,930.95