Finding the Fourth Proportional to 9,991.69, 13,788.53 and 5,799.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,991.69 : 13,788.53 = 5,799.94 : x
2. Step 2: Convert to fraction form
   9,991.69/13,788.53 = 5,799.94/x
3. Step 3: Cross multiply
   9,991.69x = 13,788.53 × 5,799.94
4. Step 4: Simplify right side
   9,991.69x = 79,972,604.97
5. Step 5: Solve for x
   x = 79,972,604.97/9,991.69
6. Step 6: Final answer
   x = 8,003.91