Finding the Fourth Proportional to 19,662.69, 27,144.24 and 13,407.87

Step by Step Solution

1. Step 1: Write the proportion equation
   19,662.69 : 27,144.24 = 13,407.87 : x
2. Step 2: Convert to fraction form
   19,662.69/27,144.24 = 13,407.87/x
3. Step 3: Cross multiply
   19,662.69x = 27,144.24 × 13,407.87
4. Step 4: Simplify right side
   19,662.69x = 363,946,441.17
5. Step 5: Solve for x
   x = 363,946,441.17/19,662.69
6. Step 6: Final answer
   x = 18,509.49