Finding the Fourth Proportional to 22,665.81, 31,278.80 and 12,456.77

Step by Step Solution

1. Step 1: Write the proportion equation
   22,665.81 : 31,278.80 = 12,456.77 : x
2. Step 2: Convert to fraction form
   22,665.81/31,278.80 = 12,456.77/x
3. Step 3: Cross multiply
   22,665.81x = 31,278.80 × 12,456.77
4. Step 4: Simplify right side
   22,665.81x = 389,632,598.80
5. Step 5: Solve for x
   x = 389,632,598.80/22,665.81
6. Step 6: Final answer
   x = 17,190.32