Finding the Fourth Proportional to 28,238.59, 42,304.42 and 18,850.30

Step by Step Solution

1. Step 1: Write the proportion equation
   28,238.59 : 42,304.42 = 18,850.30 : x
2. Step 2: Convert to fraction form
   28,238.59/42,304.42 = 18,850.30/x
3. Step 3: Cross multiply
   28,238.59x = 42,304.42 × 18,850.30
4. Step 4: Simplify right side
   28,238.59x = 797,451,008.33
5. Step 5: Solve for x
   x = 797,451,008.33/28,238.59
6. Step 6: Final answer
   x = 28,239.76