Finding the Fourth Proportional to 12,155.58, 18,221.22 and 4,755.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,155.58 : 18,221.22 = 4,755.42 : x
2. Step 2: Convert to fraction form
   12,155.58/18,221.22 = 4,755.42/x
3. Step 3: Cross multiply
   12,155.58x = 18,221.22 × 4,755.42
4. Step 4: Simplify right side
   12,155.58x = 86,649,554.01
5. Step 5: Solve for x
   x = 86,649,554.01/12,155.58
6. Step 6: Final answer
   x = 7,128.38