Finding the Fourth Proportional to 5,427.09, 8,139.89 and 2,142.54

Step by Step Solution

1. Step 1: Write the proportion equation
   5,427.09 : 8,139.89 = 2,142.54 : x
2. Step 2: Convert to fraction form
   5,427.09/8,139.89 = 2,142.54/x
3. Step 3: Cross multiply
   5,427.09x = 8,139.89 × 2,142.54
4. Step 4: Simplify right side
   5,427.09x = 17,440,045.28
5. Step 5: Solve for x
   x = 17,440,045.28/5,427.09
6. Step 6: Final answer
   x = 3,213.52