Finding the Fourth Proportional to 3,910.47, 5,396.24 and 2,142.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,910.47 : 5,396.24 = 2,142.05 : x
2. Step 2: Convert to fraction form
   3,910.47/5,396.24 = 2,142.05/x
3. Step 3: Cross multiply
   3,910.47x = 5,396.24 × 2,142.05
4. Step 4: Simplify right side
   3,910.47x = 11,558,978.20
5. Step 5: Solve for x
   x = 11,558,978.20/3,910.47
6. Step 6: Final answer
   x = 2,955.91