Finding the Fourth Proportional to 23,105.31, 31,885.79 and 13,031.78

Step by Step Solution

1. Step 1: Write the proportion equation
   23,105.31 : 31,885.79 = 13,031.78 : x
2. Step 2: Convert to fraction form
   23,105.31/31,885.79 = 13,031.78/x
3. Step 3: Cross multiply
   23,105.31x = 31,885.79 × 13,031.78
4. Step 4: Simplify right side
   23,105.31x = 415,528,375.82
5. Step 5: Solve for x
   x = 415,528,375.82/23,105.31
6. Step 6: Final answer
   x = 17,984.11