Finding the Fourth Proportional to 11,152.56, 16,721.22 and 5,309.76

Step by Step Solution

1. Step 1: Write the proportion equation
   11,152.56 : 16,721.22 = 5,309.76 : x
2. Step 2: Convert to fraction form
   11,152.56/16,721.22 = 5,309.76/x
3. Step 3: Cross multiply
   11,152.56x = 16,721.22 × 5,309.76
4. Step 4: Simplify right side
   11,152.56x = 88,785,665.11
5. Step 5: Solve for x
   x = 88,785,665.11/11,152.56
6. Step 6: Final answer
   x = 7,961.01