Finding the Fourth Proportional to 10,991, 15,188.28 and 8,333.48

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991 : 15,188.28 = 8,333.48 : x
2. Step 2: Convert to fraction form
   10,991/15,188.28 = 8,333.48/x
3. Step 3: Cross multiply
   10,991x = 15,188.28 × 8,333.48
4. Step 4: Simplify right side
   10,991x = 126,571,227.61
5. Step 5: Solve for x
   x = 126,571,227.61/10,991
6. Step 6: Final answer
   x = 11,515.90