Finding the Fourth Proportional to 31,818.79, 43,916.45 and 18,388.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,818.79 : 43,916.45 = 18,388.18 : x
2. Step 2: Convert to fraction form
   31,818.79/43,916.45 = 18,388.18/x
3. Step 3: Cross multiply
   31,818.79x = 43,916.45 × 18,388.18
4. Step 4: Simplify right side
   31,818.79x = 807,543,550.52
5. Step 5: Solve for x
   x = 807,543,550.52/31,818.79
6. Step 6: Final answer
   x = 25,379.45