Finding the Fourth Proportional to 22,665, 31,277.72 and 12,729

Step by Step Solution

1. Step 1: Write the proportion equation
   22,665 : 31,277.72 = 12,729 : x
2. Step 2: Convert to fraction form
   22,665/31,277.72 = 12,729/x
3. Step 3: Cross multiply
   22,665x = 31,277.72 × 12,729
4. Step 4: Simplify right side
   22,665x = 398,134,097.88
5. Step 5: Solve for x
   x = 398,134,097.88/22,665
6. Step 6: Final answer
   x = 17,566.03