Finding the Fourth Proportional to 22,559.42, 31,131.63 and 12,487.65

Step by Step Solution

1. Step 1: Write the proportion equation
   22,559.42 : 31,131.63 = 12,487.65 : x
2. Step 2: Convert to fraction form
   22,559.42/31,131.63 = 12,487.65/x
3. Step 3: Cross multiply
   22,559.42x = 31,131.63 × 12,487.65
4. Step 4: Simplify right side
   22,559.42x = 388,760,835.06
5. Step 5: Solve for x
   x = 388,760,835.06/22,559.42
6. Step 6: Final answer
   x = 17,232.75