Finding the Fourth Proportional to 19,337.28, 28,956.69 and 12,743.47

Step by Step Solution

1. Step 1: Write the proportion equation
   19,337.28 : 28,956.69 = 12,743.47 : x
2. Step 2: Convert to fraction form
   19,337.28/28,956.69 = 12,743.47/x
3. Step 3: Cross multiply
   19,337.28x = 28,956.69 × 12,743.47
4. Step 4: Simplify right side
   19,337.28x = 369,008,710.31
5. Step 5: Solve for x
   x = 369,008,710.31/19,337.28
6. Step 6: Final answer
   x = 19,082.76