Finding the Fourth Proportional to 9,847.80, 13,581.30 and 7,748.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,847.80 : 13,581.30 = 7,748.28 : x
2. Step 2: Convert to fraction form
   9,847.80/13,581.30 = 7,748.28/x
3. Step 3: Cross multiply
   9,847.80x = 13,581.30 × 7,748.28
4. Step 4: Simplify right side
   9,847.80x = 105,231,715.16
5. Step 5: Solve for x
   x = 105,231,715.16/9,847.80
6. Step 6: Final answer
   x = 10,685.81