Finding the Fourth Proportional to 21,171.72, 31,760.82 and 5,590.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,171.72 : 31,760.82 = 5,590.56 : x
2. Step 2: Convert to fraction form
   21,171.72/31,760.82 = 5,590.56/x
3. Step 3: Cross multiply
   21,171.72x = 31,760.82 × 5,590.56
4. Step 4: Simplify right side
   21,171.72x = 177,560,769.86
5. Step 5: Solve for x
   x = 177,560,769.86/21,171.72
6. Step 6: Final answer
   x = 8,386.70