Finding the Fourth Proportional to 12,111.56, 18,166.82 and 4,215.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.56 : 18,166.82 = 4,215.87 : x
2. Step 2: Convert to fraction form
   12,111.56/18,166.82 = 4,215.87/x
3. Step 3: Cross multiply
   12,111.56x = 18,166.82 × 4,215.87
4. Step 4: Simplify right side
   12,111.56x = 76,588,961.97
5. Step 5: Solve for x
   x = 76,588,961.97/12,111.56
6. Step 6: Final answer
   x = 6,323.63