Finding the Fourth Proportional to 31,638.24, 43,660.56 and 18,212.10

Step by Step Solution

1. Step 1: Write the proportion equation
   31,638.24 : 43,660.56 = 18,212.10 : x
2. Step 2: Convert to fraction form
   31,638.24/43,660.56 = 18,212.10/x
3. Step 3: Cross multiply
   31,638.24x = 43,660.56 × 18,212.10
4. Step 4: Simplify right side
   31,638.24x = 795,150,484.78
5. Step 5: Solve for x
   x = 795,150,484.78/31,638.24
6. Step 6: Final answer
   x = 25,132.58