Finding the Fourth Proportional to 3,900.15, 5,382.29 and 2,131.83

Step by Step Solution

1. Step 1: Write the proportion equation
   3,900.15 : 5,382.29 = 2,131.83 : x
2. Step 2: Convert to fraction form
   3,900.15/5,382.29 = 2,131.83/x
3. Step 3: Cross multiply
   3,900.15x = 5,382.29 × 2,131.83
4. Step 4: Simplify right side
   3,900.15x = 11,474,116.63
5. Step 5: Solve for x
   x = 11,474,116.63/3,900.15
6. Step 6: Final answer
   x = 2,941.97