Finding the Fourth Proportional to 9,968.76, 13,755.60 and 5,718.96

Step by Step Solution

1. Step 1: Write the proportion equation
   9,968.76 : 13,755.60 = 5,718.96 : x
2. Step 2: Convert to fraction form
   9,968.76/13,755.60 = 5,718.96/x
3. Step 3: Cross multiply
   9,968.76x = 13,755.60 × 5,718.96
4. Step 4: Simplify right side
   9,968.76x = 78,667,726.18
5. Step 5: Solve for x
   x = 78,667,726.18/9,968.76
6. Step 6: Final answer
   x = 7,891.43