Finding the Fourth Proportional to 31,688.10, 43,730.61 and 18,258.30

Step by Step Solution

1. Step 1: Write the proportion equation
   31,688.10 : 43,730.61 = 18,258.30 : x
2. Step 2: Convert to fraction form
   31,688.10/43,730.61 = 18,258.30/x
3. Step 3: Cross multiply
   31,688.10x = 43,730.61 × 18,258.30
4. Step 4: Simplify right side
   31,688.10x = 798,446,596.56
5. Step 5: Solve for x
   x = 798,446,596.56/31,688.10
6. Step 6: Final answer
   x = 25,197.05