Finding the Fourth Proportional to 16,821.72, 25,236.18 and 5,134.56

Step by Step Solution

1. Step 1: Write the proportion equation
   16,821.72 : 25,236.18 = 5,134.56 : x
2. Step 2: Convert to fraction form
   16,821.72/25,236.18 = 5,134.56/x
3. Step 3: Cross multiply
   16,821.72x = 25,236.18 × 5,134.56
4. Step 4: Simplify right side
   16,821.72x = 129,576,680.38
5. Step 5: Solve for x
   x = 129,576,680.38/16,821.72
6. Step 6: Final answer
   x = 7,702.94