Finding the Fourth Proportional to 9,986.61, 13,781.56 and 5,510.49

Step by Step Solution

1. Step 1: Write the proportion equation
   9,986.61 : 13,781.56 = 5,510.49 : x
2. Step 2: Convert to fraction form
   9,986.61/13,781.56 = 5,510.49/x
3. Step 3: Cross multiply
   9,986.61x = 13,781.56 × 5,510.49
4. Step 4: Simplify right side
   9,986.61x = 75,943,148.56
5. Step 5: Solve for x
   x = 75,943,148.56/9,986.61
6. Step 6: Final answer
   x = 7,604.50