Finding the Fourth Proportional to 9,906.48, 13,672.08 and 5,658.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,906.48 : 13,672.08 = 5,658.21 : x
2. Step 2: Convert to fraction form
   9,906.48/13,672.08 = 5,658.21/x
3. Step 3: Cross multiply
   9,906.48x = 13,672.08 × 5,658.21
4. Step 4: Simplify right side
   9,906.48x = 77,359,499.78
5. Step 5: Solve for x
   x = 77,359,499.78/9,906.48
6. Step 6: Final answer
   x = 7,808.98