Finding the Fourth Proportional to 14,399.10, 19,870.79 and 8,429.58

Step by Step Solution

1. Step 1: Write the proportion equation
   14,399.10 : 19,870.79 = 8,429.58 : x
2. Step 2: Convert to fraction form
   14,399.10/19,870.79 = 8,429.58/x
3. Step 3: Cross multiply
   14,399.10x = 19,870.79 × 8,429.58
4. Step 4: Simplify right side
   14,399.10x = 167,502,371.82
5. Step 5: Solve for x
   x = 167,502,371.82/14,399.10
6. Step 6: Final answer
   x = 11,632.84