Finding the Fourth Proportional to 9,965.79, 13,752.61 and 5,489.95

Step by Step Solution

1. Step 1: Write the proportion equation
   9,965.79 : 13,752.61 = 5,489.95 : x
2. Step 2: Convert to fraction form
   9,965.79/13,752.61 = 5,489.95/x
3. Step 3: Cross multiply
   9,965.79x = 13,752.61 × 5,489.95
4. Step 4: Simplify right side
   9,965.79x = 75,501,141.27
5. Step 5: Solve for x
   x = 75,501,141.27/9,965.79
6. Step 6: Final answer
   x = 7,576.03