Finding the Fourth Proportional to 12,155.25, 18,231.33 and 4,764.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,155.25 : 18,231.33 = 4,764.90 : x
2. Step 2: Convert to fraction form
   12,155.25/18,231.33 = 4,764.90/x
3. Step 3: Cross multiply
   12,155.25x = 18,231.33 × 4,764.90
4. Step 4: Simplify right side
   12,155.25x = 86,870,464.32
5. Step 5: Solve for x
   x = 86,870,464.32/12,155.25
6. Step 6: Final answer
   x = 7,146.74