Finding the Fourth Proportional to 19,215.43, 28,810.72 and 13,275.73

Step by Step Solution

1. Step 1: Write the proportion equation
   19,215.43 : 28,810.72 = 13,275.73 : x
2. Step 2: Convert to fraction form
   19,215.43/28,810.72 = 13,275.73/x
3. Step 3: Cross multiply
   19,215.43x = 28,810.72 × 13,275.73
4. Step 4: Simplify right side
   19,215.43x = 382,483,392.43
5. Step 5: Solve for x
   x = 382,483,392.43/19,215.43
6. Step 6: Final answer
   x = 19,905.02