Finding the Fourth Proportional to 9,986.84, 13,780.35 and 5,510.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,986.84 : 13,780.35 = 5,510.78 : x
2. Step 2: Convert to fraction form
   9,986.84/13,780.35 = 5,510.78/x
3. Step 3: Cross multiply
   9,986.84x = 13,780.35 × 5,510.78
4. Step 4: Simplify right side
   9,986.84x = 75,940,408.27
5. Step 5: Solve for x
   x = 75,940,408.27/9,986.84
6. Step 6: Final answer
   x = 7,604.05