Finding the Fourth Proportional to 12,111.78, 18,176.06 and 4,716.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.78 : 18,176.06 = 4,716.30 : x
2. Step 2: Convert to fraction form
   12,111.78/18,176.06 = 4,716.30/x
3. Step 3: Cross multiply
   12,111.78x = 18,176.06 × 4,716.30
4. Step 4: Simplify right side
   12,111.78x = 85,723,751.78
5. Step 5: Solve for x
   x = 85,723,751.78/12,111.78
6. Step 6: Final answer
   x = 7,077.72