Finding the Fourth Proportional to 22,815, 31,485.38 and 12,743.87

Step by Step Solution

1. Step 1: Write the proportion equation
   22,815 : 31,485.38 = 12,743.87 : x
2. Step 2: Convert to fraction form
   22,815/31,485.38 = 12,743.87/x
3. Step 3: Cross multiply
   22,815x = 31,485.38 × 12,743.87
4. Step 4: Simplify right side
   22,815x = 401,245,368.47
5. Step 5: Solve for x
   x = 401,245,368.47/22,815
6. Step 6: Final answer
   x = 17,586.91