Finding the Fourth Proportional to 5,239.56, 7,227.80 and 3,978.53

Step by Step Solution

1. Step 1: Write the proportion equation
   5,239.56 : 7,227.80 = 3,978.53 : x
2. Step 2: Convert to fraction form
   5,239.56/7,227.80 = 3,978.53/x
3. Step 3: Cross multiply
   5,239.56x = 7,227.80 × 3,978.53
4. Step 4: Simplify right side
   5,239.56x = 28,755,983.00
5. Step 5: Solve for x
   x = 28,755,983.00/5,239.56
6. Step 6: Final answer
   x = 5,488.24