Finding the Fourth Proportional to 21,142.72, 31,711.55 and 5,561.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,142.72 : 31,711.55 = 5,561.56 : x
2. Step 2: Convert to fraction form
   21,142.72/31,711.55 = 5,561.56/x
3. Step 3: Cross multiply
   21,142.72x = 31,711.55 × 5,561.56
4. Step 4: Simplify right side
   21,142.72x = 176,365,529.46
5. Step 5: Solve for x
   x = 176,365,529.46/21,142.72
6. Step 6: Final answer
   x = 8,341.67