Finding the Fourth Proportional to 10,890.72, 15,029.28 and 5,922.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,890.72 : 15,029.28 = 5,922.72 : x
2. Step 2: Convert to fraction form
   10,890.72/15,029.28 = 5,922.72/x
3. Step 3: Cross multiply
   10,890.72x = 15,029.28 × 5,922.72
4. Step 4: Simplify right side
   10,890.72x = 89,014,217.24
5. Step 5: Solve for x
   x = 89,014,217.24/10,890.72
6. Step 6: Final answer
   x = 8,173.40