Finding the Fourth Proportional to 10,961.30, 16,423.05 and 5,105.90

Step by Step Solution

1. Step 1: Write the proportion equation
   10,961.30 : 16,423.05 = 5,105.90 : x
2. Step 2: Convert to fraction form
   10,961.30/16,423.05 = 5,105.90/x
3. Step 3: Cross multiply
   10,961.30x = 16,423.05 × 5,105.90
4. Step 4: Simplify right side
   10,961.30x = 83,854,451.00
5. Step 5: Solve for x
   x = 83,854,451.00/10,961.30
6. Step 6: Final answer
   x = 7,650.05