Finding the Fourth Proportional to 3,840.89, 5,300.34 and 2,139.35

Step by Step Solution

1. Step 1: Write the proportion equation
   3,840.89 : 5,300.34 = 2,139.35 : x
2. Step 2: Convert to fraction form
   3,840.89/5,300.34 = 2,139.35/x
3. Step 3: Cross multiply
   3,840.89x = 5,300.34 × 2,139.35
4. Step 4: Simplify right side
   3,840.89x = 11,339,282.38
5. Step 5: Solve for x
   x = 11,339,282.38/3,840.89
6. Step 6: Final answer
   x = 2,952.25