Finding the Fourth Proportional to 13,170.84, 18,175.59 and 7,872.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,170.84 : 18,175.59 = 7,872.72 : x
2. Step 2: Convert to fraction form
   13,170.84/18,175.59 = 7,872.72/x
3. Step 3: Cross multiply
   13,170.84x = 18,175.59 × 7,872.72
4. Step 4: Simplify right side
   13,170.84x = 143,091,330.90
5. Step 5: Solve for x
   x = 143,091,330.90/13,170.84
6. Step 6: Final answer
   x = 10,864.25