Finding the Fourth Proportional to 5,548.52, 7,641.39 and 5,531.21

Step by Step Solution

1. Step 1: Write the proportion equation
   5,548.52 : 7,641.39 = 5,531.21 : x
2. Step 2: Convert to fraction form
   5,548.52/7,641.39 = 5,531.21/x
3. Step 3: Cross multiply
   5,548.52x = 7,641.39 × 5,531.21
4. Step 4: Simplify right side
   5,548.52x = 42,266,186.96
5. Step 5: Solve for x
   x = 42,266,186.96/5,548.52
6. Step 6: Final answer
   x = 7,617.56