Finding the Fourth Proportional to 12,849.91, 19,276.89 and 4,086.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,849.91 : 19,276.89 = 4,086.79 : x
2. Step 2: Convert to fraction form
   12,849.91/19,276.89 = 4,086.79/x
3. Step 3: Cross multiply
   12,849.91x = 19,276.89 × 4,086.79
4. Step 4: Simplify right side
   12,849.91x = 78,780,537.77
5. Step 5: Solve for x
   x = 78,780,537.77/12,849.91
6. Step 6: Final answer
   x = 6,130.83