Finding the Fourth Proportional to 12,211.32, 18,317.89 and 5,190.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,211.32 : 18,317.89 = 5,190.55 : x
2. Step 2: Convert to fraction form
   12,211.32/18,317.89 = 5,190.55/x
3. Step 3: Cross multiply
   12,211.32x = 18,317.89 × 5,190.55
4. Step 4: Simplify right side
   12,211.32x = 95,079,923.94
5. Step 5: Solve for x
   x = 95,079,923.94/12,211.32
6. Step 6: Final answer
   x = 7,786.21