Finding the Fourth Proportional to 9,990.71, 13,786.60 and 5,514.46

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.71 : 13,786.60 = 5,514.46 : x
2. Step 2: Convert to fraction form
   9,990.71/13,786.60 = 5,514.46/x
3. Step 3: Cross multiply
   9,990.71x = 13,786.60 × 5,514.46
4. Step 4: Simplify right side
   9,990.71x = 76,025,654.24
5. Step 5: Solve for x
   x = 76,025,654.24/9,990.71
6. Step 6: Final answer
   x = 7,609.63