Finding the Fourth Proportional to 10,981.88, 15,156.18 and 7,208.09

Step by Step Solution

1. Step 1: Write the proportion equation
   10,981.88 : 15,156.18 = 7,208.09 : x
2. Step 2: Convert to fraction form
   10,981.88/15,156.18 = 7,208.09/x
3. Step 3: Cross multiply
   10,981.88x = 15,156.18 × 7,208.09
4. Step 4: Simplify right side
   10,981.88x = 109,247,033.72
5. Step 5: Solve for x
   x = 109,247,033.72/10,981.88
6. Step 6: Final answer
   x = 9,947.94