Finding the Fourth Proportional to 3,881.85, 5,356.89 and 2,113.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,881.85 : 5,356.89 = 2,113.50 : x
2. Step 2: Convert to fraction form
   3,881.85/5,356.89 = 2,113.50/x
3. Step 3: Cross multiply
   3,881.85x = 5,356.89 × 2,113.50
4. Step 4: Simplify right side
   3,881.85x = 11,321,787.02
5. Step 5: Solve for x
   x = 11,321,787.02/3,881.85
6. Step 6: Final answer
   x = 2,916.60