Finding the Fourth Proportional to 42,942.88, 64,401.36 and 25,408

Step by Step Solution

1. Step 1: Write the proportion equation
   42,942.88 : 64,401.36 = 25,408 : x
2. Step 2: Convert to fraction form
   42,942.88/64,401.36 = 25,408/x
3. Step 3: Cross multiply
   42,942.88x = 64,401.36 × 25,408
4. Step 4: Simplify right side
   42,942.88x = 1,636,309,754.88
5. Step 5: Solve for x
   x = 1,636,309,754.88/42,942.88
6. Step 6: Final answer
   x = 38,104.33