Finding the Fourth Proportional to 22,587.42, 31,173.57 and 13,639.98

Step by Step Solution

1. Step 1: Write the proportion equation
   22,587.42 : 31,173.57 = 13,639.98 : x
2. Step 2: Convert to fraction form
   22,587.42/31,173.57 = 13,639.98/x
3. Step 3: Cross multiply
   22,587.42x = 31,173.57 × 13,639.98
4. Step 4: Simplify right side
   22,587.42x = 425,206,871.33
5. Step 5: Solve for x
   x = 425,206,871.33/22,587.42
6. Step 6: Final answer
   x = 18,824.94