Finding the Fourth Proportional to 30,878.09, 42,613.23 and 18,131.83

Step by Step Solution

1. Step 1: Write the proportion equation
   30,878.09 : 42,613.23 = 18,131.83 : x
2. Step 2: Convert to fraction form
   30,878.09/42,613.23 = 18,131.83/x
3. Step 3: Cross multiply
   30,878.09x = 42,613.23 × 18,131.83
4. Step 4: Simplify right side
   30,878.09x = 772,655,751.45
5. Step 5: Solve for x
   x = 772,655,751.45/30,878.09
6. Step 6: Final answer
   x = 25,022.78