Finding the Fourth Proportional to 9,990.89, 13,786.95 and 5,738.96

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.89 : 13,786.95 = 5,738.96 : x
2. Step 2: Convert to fraction form
   9,990.89/13,786.95 = 5,738.96/x
3. Step 3: Cross multiply
   9,990.89x = 13,786.95 × 5,738.96
4. Step 4: Simplify right side
   9,990.89x = 79,122,754.57
5. Step 5: Solve for x
   x = 79,122,754.57/9,990.89
6. Step 6: Final answer
   x = 7,919.49