Finding the Fourth Proportional to 9,713.88, 13,396.86 and 8,208.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,713.88 : 13,396.86 = 8,208.72 : x
2. Step 2: Convert to fraction form
   9,713.88/13,396.86 = 8,208.72/x
3. Step 3: Cross multiply
   9,713.88x = 13,396.86 × 8,208.72
4. Step 4: Simplify right side
   9,713.88x = 109,971,072.62
5. Step 5: Solve for x
   x = 109,971,072.62/9,713.88
6. Step 6: Final answer
   x = 11,321.02