Finding the Fourth Proportional to 21,105.42, 31,655.97 and 5,521.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,105.42 : 31,655.97 = 5,521.02 : x
2. Step 2: Convert to fraction form
   21,105.42/31,655.97 = 5,521.02/x
3. Step 3: Cross multiply
   21,105.42x = 31,655.97 × 5,521.02
4. Step 4: Simplify right side
   21,105.42x = 174,773,243.49
5. Step 5: Solve for x
   x = 174,773,243.49/21,105.42
6. Step 6: Final answer
   x = 8,280.96