Finding the Fourth Proportional to 21,222.85, 31,840.64 and 8,566.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,222.85 : 31,840.64 = 8,566.10 : x
2. Step 2: Convert to fraction form
   21,222.85/31,840.64 = 8,566.10/x
3. Step 3: Cross multiply
   21,222.85x = 31,840.64 × 8,566.10
4. Step 4: Simplify right side
   21,222.85x = 272,749,968.52
5. Step 5: Solve for x
   x = 272,749,968.52/21,222.85
6. Step 6: Final answer
   x = 12,851.71