Finding the Fourth Proportional to 19,871.60, 27,424.17 and 13,145.56

Step by Step Solution

1. Step 1: Write the proportion equation
   19,871.60 : 27,424.17 = 13,145.56 : x
2. Step 2: Convert to fraction form
   19,871.60/27,424.17 = 13,145.56/x
3. Step 3: Cross multiply
   19,871.60x = 27,424.17 × 13,145.56
4. Step 4: Simplify right side
   19,871.60x = 360,506,003.62
5. Step 5: Solve for x
   x = 360,506,003.62/19,871.60
6. Step 6: Final answer
   x = 18,141.77