Finding the Fourth Proportional to 19,109.62, 28,650.52 and 12,854.08

Step by Step Solution

1. Step 1: Write the proportion equation
   19,109.62 : 28,650.52 = 12,854.08 : x
2. Step 2: Convert to fraction form
   19,109.62/28,650.52 = 12,854.08/x
3. Step 3: Cross multiply
   19,109.62x = 28,650.52 × 12,854.08
4. Step 4: Simplify right side
   19,109.62x = 368,276,076.12
5. Step 5: Solve for x
   x = 368,276,076.12/19,109.62
6. Step 6: Final answer
   x = 19,271.76