Finding the Fourth Proportional to 9,990.26, 13,786.34 and 5,513.74

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.26 : 13,786.34 = 5,513.74 : x
2. Step 2: Convert to fraction form
   9,990.26/13,786.34 = 5,513.74/x
3. Step 3: Cross multiply
   9,990.26x = 13,786.34 × 5,513.74
4. Step 4: Simplify right side
   9,990.26x = 76,014,309.83
5. Step 5: Solve for x
   x = 76,014,309.83/9,990.26
6. Step 6: Final answer
   x = 7,608.84