Finding the Fourth Proportional to 13,142.58, 19,719.36 and 10,667.64

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.58 : 19,719.36 = 10,667.64 : x
2. Step 2: Convert to fraction form
   13,142.58/19,719.36 = 10,667.64/x
3. Step 3: Cross multiply
   13,142.58x = 19,719.36 × 10,667.64
4. Step 4: Simplify right side
   13,142.58x = 210,359,033.51
5. Step 5: Solve for x
   x = 210,359,033.51/13,142.58
6. Step 6: Final answer
   x = 16,005.92