Finding the Fourth Proportional to 13,180.67, 18,188.78 and 7,878.41

Step by Step Solution

1. Step 1: Write the proportion equation
   13,180.67 : 18,188.78 = 7,878.41 : x
2. Step 2: Convert to fraction form
   13,180.67/18,188.78 = 7,878.41/x
3. Step 3: Cross multiply
   13,180.67x = 18,188.78 × 7,878.41
4. Step 4: Simplify right side
   13,180.67x = 143,298,685.94
5. Step 5: Solve for x
   x = 143,298,685.94/13,180.67
6. Step 6: Final answer
   x = 10,871.88