Finding the Fourth Proportional to 10,989.84, 15,168.33 and 7,166.25

Step by Step Solution

1. Step 1: Write the proportion equation
   10,989.84 : 15,168.33 = 7,166.25 : x
2. Step 2: Convert to fraction form
   10,989.84/15,168.33 = 7,166.25/x
3. Step 3: Cross multiply
   10,989.84x = 15,168.33 × 7,166.25
4. Step 4: Simplify right side
   10,989.84x = 108,700,009.03
5. Step 5: Solve for x
   x = 108,700,009.03/10,989.84
6. Step 6: Final answer
   x = 9,890.96