Finding the Fourth Proportional to 22,493.47, 31,045.32 and 12,939.78

Step by Step Solution

1. Step 1: Write the proportion equation
   22,493.47 : 31,045.32 = 12,939.78 : x
2. Step 2: Convert to fraction form
   22,493.47/31,045.32 = 12,939.78/x
3. Step 3: Cross multiply
   22,493.47x = 31,045.32 × 12,939.78
4. Step 4: Simplify right side
   22,493.47x = 401,719,554.44
5. Step 5: Solve for x
   x = 401,719,554.44/22,493.47
6. Step 6: Final answer
   x = 17,859.39