Finding the Fourth Proportional to 3,899.94, 5,382.01 and 2,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899.94 : 5,382.01 = 2,131.50 : x
2. Step 2: Convert to fraction form
   3,899.94/5,382.01 = 2,131.50/x
3. Step 3: Cross multiply
   3,899.94x = 5,382.01 × 2,131.50
4. Step 4: Simplify right side
   3,899.94x = 11,471,754.32
5. Step 5: Solve for x
   x = 11,471,754.32/3,899.94
6. Step 6: Final answer
   x = 2,941.52