Finding the Fourth Proportional to 3,905.50, 5,389.72 and 2,137.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,905.50 : 5,389.72 = 2,137.10 : x
2. Step 2: Convert to fraction form
   3,905.50/5,389.72 = 2,137.10/x
3. Step 3: Cross multiply
   3,905.50x = 5,389.72 × 2,137.10
4. Step 4: Simplify right side
   3,905.50x = 11,518,359.93
5. Step 5: Solve for x
   x = 11,518,359.93/3,905.50
6. Step 6: Final answer
   x = 2,949.27