Finding the Fourth Proportional to 11,339.34, 16,997.31 and 8,211.48

Step by Step Solution

1. Step 1: Write the proportion equation
   11,339.34 : 16,997.31 = 8,211.48 : x
2. Step 2: Convert to fraction form
   11,339.34/16,997.31 = 8,211.48/x
3. Step 3: Cross multiply
   11,339.34x = 16,997.31 × 8,211.48
4. Step 4: Simplify right side
   11,339.34x = 139,573,071.12
5. Step 5: Solve for x
   x = 139,573,071.12/11,339.34
6. Step 6: Final answer
   x = 12,308.75