Finding the Fourth Proportional to 3,892.78, 5,371.96 and 2,124.35

Step by Step Solution

1. Step 1: Write the proportion equation
   3,892.78 : 5,371.96 = 2,124.35 : x
2. Step 2: Convert to fraction form
   3,892.78/5,371.96 = 2,124.35/x
3. Step 3: Cross multiply
   3,892.78x = 5,371.96 × 2,124.35
4. Step 4: Simplify right side
   3,892.78x = 11,411,923.23
5. Step 5: Solve for x
   x = 11,411,923.23/3,892.78
6. Step 6: Final answer
   x = 2,931.56