Finding the Fourth Proportional to 20,811.76, 31,215.32 and 5,229.42

Step by Step Solution

1. Step 1: Write the proportion equation
   20,811.76 : 31,215.32 = 5,229.42 : x
2. Step 2: Convert to fraction form
   20,811.76/31,215.32 = 5,229.42/x
3. Step 3: Cross multiply
   20,811.76x = 31,215.32 × 5,229.42
4. Step 4: Simplify right side
   20,811.76x = 163,238,018.71
5. Step 5: Solve for x
   x = 163,238,018.71/20,811.76
6. Step 6: Final answer
   x = 7,843.55