Finding the Fourth Proportional to 21,162.16, 31,742.76 and 5,579.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,162.16 : 31,742.76 = 5,579.72 : x
2. Step 2: Convert to fraction form
   21,162.16/31,742.76 = 5,579.72/x
3. Step 3: Cross multiply
   21,162.16x = 31,742.76 × 5,579.72
4. Step 4: Simplify right side
   21,162.16x = 177,115,712.83
5. Step 5: Solve for x
   x = 177,115,712.83/21,162.16
6. Step 6: Final answer
   x = 8,369.45