Finding the Fourth Proportional to 9,105.99, 13,658.83 and 4,425.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,105.99 : 13,658.83 = 4,425.21 : x
2. Step 2: Convert to fraction form
   9,105.99/13,658.83 = 4,425.21/x
3. Step 3: Cross multiply
   9,105.99x = 13,658.83 × 4,425.21
4. Step 4: Simplify right side
   9,105.99x = 60,443,191.10
5. Step 5: Solve for x
   x = 60,443,191.10/9,105.99
6. Step 6: Final answer
   x = 6,637.74