Finding the Fourth Proportional to 25,578.72, 38,352.24 and 9,978

Step by Step Solution

1. Step 1: Write the proportion equation
   25,578.72 : 38,352.24 = 9,978 : x
2. Step 2: Convert to fraction form
   25,578.72/38,352.24 = 9,978/x
3. Step 3: Cross multiply
   25,578.72x = 38,352.24 × 9,978
4. Step 4: Simplify right side
   25,578.72x = 382,678,650.72
5. Step 5: Solve for x
   x = 382,678,650.72/25,578.72
6. Step 6: Final answer
   x = 14,960.82