Finding the Fourth Proportional to 31,642.69, 43,677.90 and 18,219.29

Step by Step Solution

1. Step 1: Write the proportion equation
   31,642.69 : 43,677.90 = 18,219.29 : x
2. Step 2: Convert to fraction form
   31,642.69/43,677.90 = 18,219.29/x
3. Step 3: Cross multiply
   31,642.69x = 43,677.90 × 18,219.29
4. Step 4: Simplify right side
   31,642.69x = 795,780,326.69
5. Step 5: Solve for x
   x = 795,780,326.69/31,642.69
6. Step 6: Final answer
   x = 25,148.95