Finding the Fourth Proportional to 14,109.35, 21,145.46 and 7,872.30

Step by Step Solution

1. Step 1: Write the proportion equation
   14,109.35 : 21,145.46 = 7,872.30 : x
2. Step 2: Convert to fraction form
   14,109.35/21,145.46 = 7,872.30/x
3. Step 3: Cross multiply
   14,109.35x = 21,145.46 × 7,872.30
4. Step 4: Simplify right side
   14,109.35x = 166,463,404.76
5. Step 5: Solve for x
   x = 166,463,404.76/14,109.35
6. Step 6: Final answer
   x = 11,798.09