Finding the Fourth Proportional to 9,917.84, 13,687.89 and 5,726.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,917.84 : 13,687.89 = 5,726.09 : x
2. Step 2: Convert to fraction form
   9,917.84/13,687.89 = 5,726.09/x
3. Step 3: Cross multiply
   9,917.84x = 13,687.89 × 5,726.09
4. Step 4: Simplify right side
   9,917.84x = 78,378,102.80
5. Step 5: Solve for x
   x = 78,378,102.80/9,917.84
6. Step 6: Final answer
   x = 7,902.74