Finding the Fourth Proportional to 9,963.28, 13,748.78 and 5,486.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,963.28 : 13,748.78 = 5,486.18 : x
2. Step 2: Convert to fraction form
   9,963.28/13,748.78 = 5,486.18/x
3. Step 3: Cross multiply
   9,963.28x = 13,748.78 × 5,486.18
4. Step 4: Simplify right side
   9,963.28x = 75,428,288.80
5. Step 5: Solve for x
   x = 75,428,288.80/9,963.28
6. Step 6: Final answer
   x = 7,570.63