Finding the Fourth Proportional to 21,168.72, 31,756.32 and 5,587.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,168.72 : 31,756.32 = 5,587.56 : x
2. Step 2: Convert to fraction form
   21,168.72/31,756.32 = 5,587.56/x
3. Step 3: Cross multiply
   21,168.72x = 31,756.32 × 5,587.56
4. Step 4: Simplify right side
   21,168.72x = 177,440,343.38
5. Step 5: Solve for x
   x = 177,440,343.38/21,168.72
6. Step 6: Final answer
   x = 8,382.20