Finding the Fourth Proportional to 13,179.72, 18,179.06 and 7,872.60

Step by Step Solution

1. Step 1: Write the proportion equation
   13,179.72 : 18,179.06 = 7,872.60 : x
2. Step 2: Convert to fraction form
   13,179.72/18,179.06 = 7,872.60/x
3. Step 3: Cross multiply
   13,179.72x = 18,179.06 × 7,872.60
4. Step 4: Simplify right side
   13,179.72x = 143,116,428.39
5. Step 5: Solve for x
   x = 143,116,428.39/13,179.72
6. Step 6: Final answer
   x = 10,858.84