Finding the Fourth Proportional to 12,111.77, 18,174.68 and 5,091.23

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.77 : 18,174.68 = 5,091.23 : x
2. Step 2: Convert to fraction form
   12,111.77/18,174.68 = 5,091.23/x
3. Step 3: Cross multiply
   12,111.77x = 18,174.68 × 5,091.23
4. Step 4: Simplify right side
   12,111.77x = 92,531,359.73
5. Step 5: Solve for x
   x = 92,531,359.73/12,111.77
6. Step 6: Final answer
   x = 7,639.79