Finding the Fourth Proportional to 12,780.36, 17,643.82 and 8,963.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,780.36 : 17,643.82 = 8,963.72 : x
2. Step 2: Convert to fraction form
   12,780.36/17,643.82 = 8,963.72/x
3. Step 3: Cross multiply
   12,780.36x = 17,643.82 × 8,963.72
4. Step 4: Simplify right side
   12,780.36x = 158,154,262.21
5. Step 5: Solve for x
   x = 158,154,262.21/12,780.36
6. Step 6: Final answer
   x = 12,374.79