Finding the Fourth Proportional to 3,881.69, 5,356.71 and 2,113.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,881.69 : 5,356.71 = 2,113.31 : x
2. Step 2: Convert to fraction form
   3,881.69/5,356.71 = 2,113.31/x
3. Step 3: Cross multiply
   3,881.69x = 5,356.71 × 2,113.31
4. Step 4: Simplify right side
   3,881.69x = 11,320,362.03
5. Step 5: Solve for x
   x = 11,320,362.03/3,881.69
6. Step 6: Final answer
   x = 2,916.35