Finding the Fourth Proportional to 21,288.52, 31,944.54 and 8,142.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,288.52 : 31,944.54 = 8,142.76 : x
2. Step 2: Convert to fraction form
   21,288.52/31,944.54 = 8,142.76/x
3. Step 3: Cross multiply
   21,288.52x = 31,944.54 × 8,142.76
4. Step 4: Simplify right side
   21,288.52x = 260,116,722.53
5. Step 5: Solve for x
   x = 260,116,722.53/21,288.52
6. Step 6: Final answer
   x = 12,218.64