Finding the Fourth Proportional to 30,900.39, 42,663.02 and 18,329.19

Step by Step Solution

1. Step 1: Write the proportion equation
   30,900.39 : 42,663.02 = 18,329.19 : x
2. Step 2: Convert to fraction form
   30,900.39/42,663.02 = 18,329.19/x
3. Step 3: Cross multiply
   30,900.39x = 42,663.02 × 18,329.19
4. Step 4: Simplify right side
   30,900.39x = 781,978,507.91
5. Step 5: Solve for x
   x = 781,978,507.91/30,900.39
6. Step 6: Final answer
   x = 25,306.43