Finding the Fourth Proportional to 31,399.26, 43,338.42 and 17,978.24

Step by Step Solution

1. Step 1: Write the proportion equation
   31,399.26 : 43,338.42 = 17,978.24 : x
2. Step 2: Convert to fraction form
   31,399.26/43,338.42 = 17,978.24/x
3. Step 3: Cross multiply
   31,399.26x = 43,338.42 × 17,978.24
4. Step 4: Simplify right side
   31,399.26x = 779,148,515.98
5. Step 5: Solve for x
   x = 779,148,515.98/31,399.26
6. Step 6: Final answer
   x = 24,814.23