Finding the Fourth Proportional to 21,748.65, 30,011.71 and 12,794.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,748.65 : 30,011.71 = 12,794.42 : x
2. Step 2: Convert to fraction form
   21,748.65/30,011.71 = 12,794.42/x
3. Step 3: Cross multiply
   21,748.65x = 30,011.71 × 12,794.42
4. Step 4: Simplify right side
   21,748.65x = 383,982,208.63
5. Step 5: Solve for x
   x = 383,982,208.63/21,748.65
6. Step 6: Final answer
   x = 17,655.45