Finding the Fourth Proportional to 9,766.55, 14,615.79 and 7,991.03

Step by Step Solution

1. Step 1: Write the proportion equation
   9,766.55 : 14,615.79 = 7,991.03 : x
2. Step 2: Convert to fraction form
   9,766.55/14,615.79 = 7,991.03/x
3. Step 3: Cross multiply
   9,766.55x = 14,615.79 × 7,991.03
4. Step 4: Simplify right side
   9,766.55x = 116,795,143.28
5. Step 5: Solve for x
   x = 116,795,143.28/9,766.55
6. Step 6: Final answer
   x = 11,958.70