Finding the Fourth Proportional to 10,941.72, 16,398.72 and 6,991.47

Step by Step Solution

1. Step 1: Write the proportion equation
   10,941.72 : 16,398.72 = 6,991.47 : x
2. Step 2: Convert to fraction form
   10,941.72/16,398.72 = 6,991.47/x
3. Step 3: Cross multiply
   10,941.72x = 16,398.72 × 6,991.47
4. Step 4: Simplify right side
   10,941.72x = 114,651,158.92
5. Step 5: Solve for x
   x = 114,651,158.92/10,941.72
6. Step 6: Final answer
   x = 10,478.35