Finding the Fourth Proportional to 5,897.56, 8,139.42 and 5,399.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,897.56 : 8,139.42 = 5,399.30 : x
2. Step 2: Convert to fraction form
   5,897.56/8,139.42 = 5,399.30/x
3. Step 3: Cross multiply
   5,897.56x = 8,139.42 × 5,399.30
4. Step 4: Simplify right side
   5,897.56x = 43,947,190.75
5. Step 5: Solve for x
   x = 43,947,190.75/5,897.56
6. Step 6: Final answer
   x = 7,451.76