Finding the Fourth Proportional to 17,646.78, 26,451.72 and 12,959.82

Step by Step Solution

1. Step 1: Write the proportion equation
   17,646.78 : 26,451.72 = 12,959.82 : x
2. Step 2: Convert to fraction form
   17,646.78/26,451.72 = 12,959.82/x
3. Step 3: Cross multiply
   17,646.78x = 26,451.72 × 12,959.82
4. Step 4: Simplify right side
   17,646.78x = 342,809,529.89
5. Step 5: Solve for x
   x = 342,809,529.89/17,646.78
6. Step 6: Final answer
   x = 19,426.18