Finding the Fourth Proportional to 31,148.69, 42,990.77 and 18,574.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,148.69 : 42,990.77 = 18,574.25 : x
2. Step 2: Convert to fraction form
   31,148.69/42,990.77 = 18,574.25/x
3. Step 3: Cross multiply
   31,148.69x = 42,990.77 × 18,574.25
4. Step 4: Simplify right side
   31,148.69x = 798,521,216.80
5. Step 5: Solve for x
   x = 798,521,216.80/31,148.69
6. Step 6: Final answer
   x = 25,635.79