Finding the Fourth Proportional to 11,154.83, 16,721.37 and 5,309.87

Step by Step Solution

1. Step 1: Write the proportion equation
   11,154.83 : 16,721.37 = 5,309.87 : x
2. Step 2: Convert to fraction form
   11,154.83/16,721.37 = 5,309.87/x
3. Step 3: Cross multiply
   11,154.83x = 16,721.37 × 5,309.87
4. Step 4: Simplify right side
   11,154.83x = 88,788,274.37
5. Step 5: Solve for x
   x = 88,788,274.37/11,154.83
6. Step 6: Final answer
   x = 7,959.63