Finding the Fourth Proportional to 3,892.15, 5,371.16 and 2,123.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,892.15 : 5,371.16 = 2,123.76 : x
2. Step 2: Convert to fraction form
   3,892.15/5,371.16 = 2,123.76/x
3. Step 3: Cross multiply
   3,892.15x = 5,371.16 × 2,123.76
4. Step 4: Simplify right side
   3,892.15x = 11,407,054.76
5. Step 5: Solve for x
   x = 11,407,054.76/3,892.15
6. Step 6: Final answer
   x = 2,930.78