Finding the Fourth Proportional to 9,138.21, 12,610.38 and 5,105.25

Step by Step Solution

1. Step 1: Write the proportion equation
   9,138.21 : 12,610.38 = 5,105.25 : x
2. Step 2: Convert to fraction form
   9,138.21/12,610.38 = 5,105.25/x
3. Step 3: Cross multiply
   9,138.21x = 12,610.38 × 5,105.25
4. Step 4: Simplify right side
   9,138.21x = 64,379,142.50
5. Step 5: Solve for x
   x = 64,379,142.50/9,138.21
6. Step 6: Final answer
   x = 7,045.05