Finding the Fourth Proportional to 10,829.96, 16,235.34 and 5,280.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,829.96 : 16,235.34 = 5,280.20 : x
2. Step 2: Convert to fraction form
   10,829.96/16,235.34 = 5,280.20/x
3. Step 3: Cross multiply
   10,829.96x = 16,235.34 × 5,280.20
4. Step 4: Simplify right side
   10,829.96x = 85,725,842.27
5. Step 5: Solve for x
   x = 85,725,842.27/10,829.96
6. Step 6: Final answer
   x = 7,915.62