Finding the Fourth Proportional to 2,884.31, 3,980.71 and 1,998.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,884.31 : 3,980.71 = 1,998.57 : x
2. Step 2: Convert to fraction form
   2,884.31/3,980.71 = 1,998.57/x
3. Step 3: Cross multiply
   2,884.31x = 3,980.71 × 1,998.57
4. Step 4: Simplify right side
   2,884.31x = 7,955,745.01
5. Step 5: Solve for x
   x = 7,955,745.01/2,884.31
6. Step 6: Final answer
   x = 2,758.28