Finding the Fourth Proportional to 21,240.72, 31,858.60 and 5,659.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,240.72 : 31,858.60 = 5,659.56 : x
2. Step 2: Convert to fraction form
   21,240.72/31,858.60 = 5,659.56/x
3. Step 3: Cross multiply
   21,240.72x = 31,858.60 × 5,659.56
4. Step 4: Simplify right side
   21,240.72x = 180,305,658.22
5. Step 5: Solve for x
   x = 180,305,658.22/21,240.72
6. Step 6: Final answer
   x = 8,488.68