Finding the Fourth Proportional to 10,826.10, 16,239.15 and 7,910.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,826.10 : 16,239.15 = 7,910.10 : x
2. Step 2: Convert to fraction form
   10,826.10/16,239.15 = 7,910.10/x
3. Step 3: Cross multiply
   10,826.10x = 16,239.15 × 7,910.10
4. Step 4: Simplify right side
   10,826.10x = 128,453,300.42
5. Step 5: Solve for x
   x = 128,453,300.42/10,826.10
6. Step 6: Final answer
   x = 11,865.15