Finding the Fourth Proportional to 22,216.72, 30,665.64 and 12,791.92

Step by Step Solution

1. Step 1: Write the proportion equation
   22,216.72 : 30,665.64 = 12,791.92 : x
2. Step 2: Convert to fraction form
   22,216.72/30,665.64 = 12,791.92/x
3. Step 3: Cross multiply
   22,216.72x = 30,665.64 × 12,791.92
4. Step 4: Simplify right side
   22,216.72x = 392,272,413.63
5. Step 5: Solve for x
   x = 392,272,413.63/22,216.72
6. Step 6: Final answer
   x = 17,656.63