Finding the Fourth Proportional to 13,382.36, 20,109.86 and 7,146.71

Step by Step Solution

1. Step 1: Write the proportion equation
   13,382.36 : 20,109.86 = 7,146.71 : x
2. Step 2: Convert to fraction form
   13,382.36/20,109.86 = 7,146.71/x
3. Step 3: Cross multiply
   13,382.36x = 20,109.86 × 7,146.71
4. Step 4: Simplify right side
   13,382.36x = 143,719,301.83
5. Step 5: Solve for x
   x = 143,719,301.83/13,382.36
6. Step 6: Final answer
   x = 10,739.46