Finding the Fourth Proportional to 9,986.67, 13,781.68 and 5,510.59

Step by Step Solution

1. Step 1: Write the proportion equation
   9,986.67 : 13,781.68 = 5,510.59 : x
2. Step 2: Convert to fraction form
   9,986.67/13,781.68 = 5,510.59/x
3. Step 3: Cross multiply
   9,986.67x = 13,781.68 × 5,510.59
4. Step 4: Simplify right side
   9,986.67x = 75,945,187.99
5. Step 5: Solve for x
   x = 75,945,187.99/9,986.67
6. Step 6: Final answer
   x = 7,604.66