Finding the Fourth Proportional to 9,910.62, 13,690.89 and 7,918.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,910.62 : 13,690.89 = 7,918.56 : x
2. Step 2: Convert to fraction form
   9,910.62/13,690.89 = 7,918.56/x
3. Step 3: Cross multiply
   9,910.62x = 13,690.89 × 7,918.56
4. Step 4: Simplify right side
   9,910.62x = 108,412,133.92
5. Step 5: Solve for x
   x = 108,412,133.92/9,910.62
6. Step 6: Final answer
   x = 10,938.99