Finding the Fourth Proportional to 9,986.48, 13,781.31 and 5,510.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,986.48 : 13,781.31 = 5,510.21 : x
2. Step 2: Convert to fraction form
   9,986.48/13,781.31 = 5,510.21/x
3. Step 3: Cross multiply
   9,986.48x = 13,781.31 × 5,510.21
4. Step 4: Simplify right side
   9,986.48x = 75,937,861.37
5. Step 5: Solve for x
   x = 75,937,861.37/9,986.48
6. Step 6: Final answer
   x = 7,604.07