Finding the Fourth Proportional to 3,809.83, 5,257.47 and 2,131.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,809.83 : 5,257.47 = 2,131.31 : x
2. Step 2: Convert to fraction form
   3,809.83/5,257.47 = 2,131.31/x
3. Step 3: Cross multiply
   3,809.83x = 5,257.47 × 2,131.31
4. Step 4: Simplify right side
   3,809.83x = 11,205,298.39
5. Step 5: Solve for x
   x = 11,205,298.39/3,809.83
6. Step 6: Final answer
   x = 2,941.15