Finding the Fourth Proportional to 9,991.57, 13,788.83 and 5,744.01

Step by Step Solution

1. Step 1: Write the proportion equation
   9,991.57 : 13,788.83 = 5,744.01 : x
2. Step 2: Convert to fraction form
   9,991.57/13,788.83 = 5,744.01/x
3. Step 3: Cross multiply
   9,991.57x = 13,788.83 × 5,744.01
4. Step 4: Simplify right side
   9,991.57x = 79,203,148.69
5. Step 5: Solve for x
   x = 79,203,148.69/9,991.57
6. Step 6: Final answer
   x = 7,927.00