Finding the Fourth Proportional to 9,986.66, 13,781.50 and 5,510.45

Step by Step Solution

1. Step 1: Write the proportion equation
   9,986.66 : 13,781.50 = 5,510.45 : x
2. Step 2: Convert to fraction form
   9,986.66/13,781.50 = 5,510.45/x
3. Step 3: Cross multiply
   9,986.66x = 13,781.50 × 5,510.45
4. Step 4: Simplify right side
   9,986.66x = 75,942,287.35
5. Step 5: Solve for x
   x = 75,942,287.35/9,986.66
6. Step 6: Final answer
   x = 7,604.37