Finding the Fourth Proportional to 9,990.69, 13,786.20 and 5,514.63

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.69 : 13,786.20 = 5,514.63 : x
2. Step 2: Convert to fraction form
   9,990.69/13,786.20 = 5,514.63/x
3. Step 3: Cross multiply
   9,990.69x = 13,786.20 × 5,514.63
4. Step 4: Simplify right side
   9,990.69x = 76,025,792.11
5. Step 5: Solve for x
   x = 76,025,792.11/9,990.69
6. Step 6: Final answer
   x = 7,609.66