Finding the Fourth Proportional to 12,686.65, 19,025.31 and 4,364.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,686.65 : 19,025.31 = 4,364.31 : x
2. Step 2: Convert to fraction form
   12,686.65/19,025.31 = 4,364.31/x
3. Step 3: Cross multiply
   12,686.65x = 19,025.31 × 4,364.31
4. Step 4: Simplify right side
   12,686.65x = 83,032,350.69
5. Step 5: Solve for x
   x = 83,032,350.69/12,686.65
6. Step 6: Final answer
   x = 6,544.86