Finding the Fourth Proportional to 10,991.29, 16,469.64 and 8,498.56

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991.29 : 16,469.64 = 8,498.56 : x
2. Step 2: Convert to fraction form
   10,991.29/16,469.64 = 8,498.56/x
3. Step 3: Cross multiply
   10,991.29x = 16,469.64 × 8,498.56
4. Step 4: Simplify right side
   10,991.29x = 139,968,264.89
5. Step 5: Solve for x
   x = 139,968,264.89/10,991.29
6. Step 6: Final answer
   x = 12,734.47