Finding the Fourth Proportional to 9,910.40, 13,677.72 and 5,718.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,910.40 : 13,677.72 = 5,718.56 : x
2. Step 2: Convert to fraction form
   9,910.40/13,677.72 = 5,718.56/x
3. Step 3: Cross multiply
   9,910.40x = 13,677.72 × 5,718.56
4. Step 4: Simplify right side
   9,910.40x = 78,216,862.48
5. Step 5: Solve for x
   x = 78,216,862.48/9,910.40
6. Step 6: Final answer
   x = 7,892.40