Finding the Fourth Proportional to 10,959.30, 16,428.15 and 5,408.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,959.30 : 16,428.15 = 5,408.10 : x
2. Step 2: Convert to fraction form
   10,959.30/16,428.15 = 5,408.10/x
3. Step 3: Cross multiply
   10,959.30x = 16,428.15 × 5,408.10
4. Step 4: Simplify right side
   10,959.30x = 88,845,078.02
5. Step 5: Solve for x
   x = 88,845,078.02/10,959.30
6. Step 6: Final answer
   x = 8,106.82