Finding the Fourth Proportional to 9,751.62, 13,446.78 and 7,861.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,751.62 : 13,446.78 = 7,861.20 : x
2. Step 2: Convert to fraction form
   9,751.62/13,446.78 = 7,861.20/x
3. Step 3: Cross multiply
   9,751.62x = 13,446.78 × 7,861.20
4. Step 4: Simplify right side
   9,751.62x = 105,707,826.94
5. Step 5: Solve for x
   x = 105,707,826.94/9,751.62
6. Step 6: Final answer
   x = 10,840.03