Finding the Fourth Proportional to 9,978.54, 13,769.94 and 5,441.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.54 : 13,769.94 = 5,441.12 : x
2. Step 2: Convert to fraction form
   9,978.54/13,769.94 = 5,441.12/x
3. Step 3: Cross multiply
   9,978.54x = 13,769.94 × 5,441.12
4. Step 4: Simplify right side
   9,978.54x = 74,923,827.08
5. Step 5: Solve for x
   x = 74,923,827.08/9,978.54
6. Step 6: Final answer
   x = 7,508.50