Finding the Fourth Proportional to 9,990.32, 13,786.64 and 5,514.37

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.32 : 13,786.64 = 5,514.37 : x
2. Step 2: Convert to fraction form
   9,990.32/13,786.64 = 5,514.37/x
3. Step 3: Cross multiply
   9,990.32x = 13,786.64 × 5,514.37
4. Step 4: Simplify right side
   9,990.32x = 76,024,683.78
5. Step 5: Solve for x
   x = 76,024,683.78/9,990.32
6. Step 6: Final answer
   x = 7,609.84