Finding the Fourth Proportional to 12,139.81, 18,211.80 and 5,566.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,139.81 : 18,211.80 = 5,566.56 : x
2. Step 2: Convert to fraction form
   12,139.81/18,211.80 = 5,566.56/x
3. Step 3: Cross multiply
   12,139.81x = 18,211.80 × 5,566.56
4. Step 4: Simplify right side
   12,139.81x = 101,377,077.41
5. Step 5: Solve for x
   x = 101,377,077.41/12,139.81
6. Step 6: Final answer
   x = 8,350.80