Finding the Fourth Proportional to 9,990.45, 13,786.89 and 5,514.23

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.45 : 13,786.89 = 5,514.23 : x
2. Step 2: Convert to fraction form
   9,990.45/13,786.89 = 5,514.23/x
3. Step 3: Cross multiply
   9,990.45x = 13,786.89 × 5,514.23
4. Step 4: Simplify right side
   9,990.45x = 76,024,013.51
5. Step 5: Solve for x
   x = 76,024,013.51/9,990.45
6. Step 6: Final answer
   x = 7,609.67