Finding the Fourth Proportional to 31,818.34, 43,906.74 and 18,390.47

Step by Step Solution

1. Step 1: Write the proportion equation
   31,818.34 : 43,906.74 = 18,390.47 : x
2. Step 2: Convert to fraction form
   31,818.34/43,906.74 = 18,390.47/x
3. Step 3: Cross multiply
   31,818.34x = 43,906.74 × 18,390.47
4. Step 4: Simplify right side
   31,818.34x = 807,465,399.72
5. Step 5: Solve for x
   x = 807,465,399.72/31,818.34
6. Step 6: Final answer
   x = 25,377.36