Finding the Fourth Proportional to 2,644.69, 3,971.21 and 2,101.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,644.69 : 3,971.21 = 2,101.43 : x
2. Step 2: Convert to fraction form
   2,644.69/3,971.21 = 2,101.43/x
3. Step 3: Cross multiply
   2,644.69x = 3,971.21 × 2,101.43
4. Step 4: Simplify right side
   2,644.69x = 8,345,219.83
5. Step 5: Solve for x
   x = 8,345,219.83/2,644.69
6. Step 6: Final answer
   x = 3,155.46