Finding the Fourth Proportional to 21,288.54, 31,931.98 and 5,705.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,288.54 : 31,931.98 = 5,705.76 : x
2. Step 2: Convert to fraction form
   21,288.54/31,931.98 = 5,705.76/x
3. Step 3: Cross multiply
   21,288.54x = 31,931.98 × 5,705.76
4. Step 4: Simplify right side
   21,288.54x = 182,196,214.20
5. Step 5: Solve for x
   x = 182,196,214.20/21,288.54
6. Step 6: Final answer
   x = 8,558.42