Finding the Fourth Proportional to 12,878.72, 17,780.48 and 12,084.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,878.72 : 17,780.48 = 12,084.48 : x
2. Step 2: Convert to fraction form
   12,878.72/17,780.48 = 12,084.48/x
3. Step 3: Cross multiply
   12,878.72x = 17,780.48 × 12,084.48
4. Step 4: Simplify right side
   12,878.72x = 214,867,854.95
5. Step 5: Solve for x
   x = 214,867,854.95/12,878.72
6. Step 6: Final answer
   x = 16,683.94