Finding the Fourth Proportional to 11,690.56, 16,138.79 and 7,216.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,690.56 : 16,138.79 = 7,216.78 : x
2. Step 2: Convert to fraction form
   11,690.56/16,138.79 = 7,216.78/x
3. Step 3: Cross multiply
   11,690.56x = 16,138.79 × 7,216.78
4. Step 4: Simplify right side
   11,690.56x = 116,470,118.38
5. Step 5: Solve for x
   x = 116,470,118.38/11,690.56
6. Step 6: Final answer
   x = 9,962.75