Finding the Fourth Proportional to 12,709.98, 19,067.51 and 4,390.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,709.98 : 19,067.51 = 4,390.30 : x
2. Step 2: Convert to fraction form
   12,709.98/19,067.51 = 4,390.30/x
3. Step 3: Cross multiply
   12,709.98x = 19,067.51 × 4,390.30
4. Step 4: Simplify right side
   12,709.98x = 83,712,089.15
5. Step 5: Solve for x
   x = 83,712,089.15/12,709.98
6. Step 6: Final answer
   x = 6,586.33