Finding the Fourth Proportional to 9,990.38, 13,786.86 and 5,742.08

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.38 : 13,786.86 = 5,742.08 : x
2. Step 2: Convert to fraction form
   9,990.38/13,786.86 = 5,742.08/x
3. Step 3: Cross multiply
   9,990.38x = 13,786.86 × 5,742.08
4. Step 4: Simplify right side
   9,990.38x = 79,165,253.07
5. Step 5: Solve for x
   x = 79,165,253.07/9,990.38
6. Step 6: Final answer
   x = 7,924.15