Finding the Fourth Proportional to 9,918.56, 13,686.32 and 7,907.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,918.56 : 13,686.32 = 7,907.06 : x
2. Step 2: Convert to fraction form
   9,918.56/13,686.32 = 7,907.06/x
3. Step 3: Cross multiply
   9,918.56x = 13,686.32 × 7,907.06
4. Step 4: Simplify right side
   9,918.56x = 108,218,553.42
5. Step 5: Solve for x
   x = 108,218,553.42/9,918.56
6. Step 6: Final answer
   x = 10,910.71