Finding the Fourth Proportional to 19,111.27, 28,668.72 and 7,425.40

Step by Step Solution

1. Step 1: Write the proportion equation
   19,111.27 : 28,668.72 = 7,425.40 : x
2. Step 2: Convert to fraction form
   19,111.27/28,668.72 = 7,425.40/x
3. Step 3: Cross multiply
   19,111.27x = 28,668.72 × 7,425.40
4. Step 4: Simplify right side
   19,111.27x = 212,876,713.49
5. Step 5: Solve for x
   x = 212,876,713.49/19,111.27
6. Step 6: Final answer
   x = 11,138.81