Finding the Fourth Proportional to 3,892.45, 5,371.71 and 2,124.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,892.45 : 5,371.71 = 2,124.15 : x
2. Step 2: Convert to fraction form
   3,892.45/5,371.71 = 2,124.15/x
3. Step 3: Cross multiply
   3,892.45x = 5,371.71 × 2,124.15
4. Step 4: Simplify right side
   3,892.45x = 11,410,312.49
5. Step 5: Solve for x
   x = 11,410,312.49/3,892.45
6. Step 6: Final answer
   x = 2,931.40