Finding the Fourth Proportional to 9,990.23, 13,786.28 and 5,513.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.23 : 13,786.28 = 5,513.99 : x
2. Step 2: Convert to fraction form
   9,990.23/13,786.28 = 5,513.99/x
3. Step 3: Cross multiply
   9,990.23x = 13,786.28 × 5,513.99
4. Step 4: Simplify right side
   9,990.23x = 76,017,410.06
5. Step 5: Solve for x
   x = 76,017,410.06/9,990.23
6. Step 6: Final answer
   x = 7,609.18