Finding the Fourth Proportional to 3,896.86, 5,377.67 and 2,128.46

Step by Step Solution

1. Step 1: Write the proportion equation
   3,896.86 : 5,377.67 = 2,128.46 : x
2. Step 2: Convert to fraction form
   3,896.86/5,377.67 = 2,128.46/x
3. Step 3: Cross multiply
   3,896.86x = 5,377.67 × 2,128.46
4. Step 4: Simplify right side
   3,896.86x = 11,446,172.89
5. Step 5: Solve for x
   x = 11,446,172.89/3,896.86
6. Step 6: Final answer
   x = 2,937.28