Finding the Fourth Proportional to 3,938.02, 5,434.31 and 2,169.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,938.02 : 5,434.31 = 2,169.50 : x
2. Step 2: Convert to fraction form
   3,938.02/5,434.31 = 2,169.50/x
3. Step 3: Cross multiply
   3,938.02x = 5,434.31 × 2,169.50
4. Step 4: Simplify right side
   3,938.02x = 11,789,735.55
5. Step 5: Solve for x
   x = 11,789,735.55/3,938.02
6. Step 6: Final answer
   x = 2,993.82