Finding the Fourth Proportional to 14,145.48, 19,520.64 and 7,857.72

Step by Step Solution

1. Step 1: Write the proportion equation
   14,145.48 : 19,520.64 = 7,857.72 : x
2. Step 2: Convert to fraction form
   14,145.48/19,520.64 = 7,857.72/x
3. Step 3: Cross multiply
   14,145.48x = 19,520.64 × 7,857.72
4. Step 4: Simplify right side
   14,145.48x = 153,387,723.34
5. Step 5: Solve for x
   x = 153,387,723.34/14,145.48
6. Step 6: Final answer
   x = 10,843.59