Finding the Fourth Proportional to 12,111.70, 18,167.55 and 7,716.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.70 : 18,167.55 = 7,716.10 : x
2. Step 2: Convert to fraction form
   12,111.70/18,167.55 = 7,716.10/x
3. Step 3: Cross multiply
   12,111.70x = 18,167.55 × 7,716.10
4. Step 4: Simplify right side
   12,111.70x = 140,182,632.56
5. Step 5: Solve for x
   x = 140,182,632.56/12,111.70
6. Step 6: Final answer
   x = 11,574.15