Finding the Fourth Proportional to 30,805.72, 42,418.69 and 25,408.08

Step by Step Solution

1. Step 1: Write the proportion equation
   30,805.72 : 42,418.69 = 25,408.08 : x
2. Step 2: Convert to fraction form
   30,805.72/42,418.69 = 25,408.08/x
3. Step 3: Cross multiply
   30,805.72x = 42,418.69 × 25,408.08
4. Step 4: Simplify right side
   30,805.72x = 1,077,777,405.50
5. Step 5: Solve for x
   x = 1,077,777,405.50/30,805.72
6. Step 6: Final answer
   x = 34,986.28