Finding the Fourth Proportional to 19,109.42, 28,613.37 and 12,859.82

Step by Step Solution

1. Step 1: Write the proportion equation
   19,109.42 : 28,613.37 = 12,859.82 : x
2. Step 2: Convert to fraction form
   19,109.42/28,613.37 = 12,859.82/x
3. Step 3: Cross multiply
   19,109.42x = 28,613.37 × 12,859.82
4. Step 4: Simplify right side
   19,109.42x = 367,962,787.79
5. Step 5: Solve for x
   x = 367,962,787.79/19,109.42
6. Step 6: Final answer
   x = 19,255.57