Finding the Fourth Proportional to 9,990.47, 13,786.80 and 5,514.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.47 : 13,786.80 = 5,514.18 : x
2. Step 2: Convert to fraction form
   9,990.47/13,786.80 = 5,514.18/x
3. Step 3: Cross multiply
   9,990.47x = 13,786.80 × 5,514.18
4. Step 4: Simplify right side
   9,990.47x = 76,022,896.82
5. Step 5: Solve for x
   x = 76,022,896.82/9,990.47
6. Step 6: Final answer
   x = 7,609.55