Finding the Fourth Proportional to 12,128.73, 18,196.53 and 5,105.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,128.73 : 18,196.53 = 5,105.22 : x
2. Step 2: Convert to fraction form
   12,128.73/18,196.53 = 5,105.22/x
3. Step 3: Cross multiply
   12,128.73x = 18,196.53 × 5,105.22
4. Step 4: Simplify right side
   12,128.73x = 92,897,288.89
5. Step 5: Solve for x
   x = 92,897,288.89/12,128.73
6. Step 6: Final answer
   x = 7,659.28