Finding the Fourth Proportional to 12,981.78, 19,494.52 and 12,879.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,981.78 : 19,494.52 = 12,879.72 : x
2. Step 2: Convert to fraction form
   12,981.78/19,494.52 = 12,879.72/x
3. Step 3: Cross multiply
   12,981.78x = 19,494.52 × 12,879.72
4. Step 4: Simplify right side
   12,981.78x = 251,083,959.13
5. Step 5: Solve for x
   x = 251,083,959.13/12,981.78
6. Step 6: Final answer
   x = 19,341.26