Finding the Fourth Proportional to 19,780.11, 27,304.43 and 12,976.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,780.11 : 27,304.43 = 12,976.72 : x
2. Step 2: Convert to fraction form
   19,780.11/27,304.43 = 12,976.72/x
3. Step 3: Cross multiply
   19,780.11x = 27,304.43 × 12,976.72
4. Step 4: Simplify right side
   19,780.11x = 354,321,809.72
5. Step 5: Solve for x
   x = 354,321,809.72/19,780.11
6. Step 6: Final answer
   x = 17,913.04