Finding the Fourth Proportional to 13,196.81, 18,207.13 and 7,817.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.81 : 18,207.13 = 7,817.56 : x
2. Step 2: Convert to fraction form
   13,196.81/18,207.13 = 7,817.56/x
3. Step 3: Cross multiply
   13,196.81x = 18,207.13 × 7,817.56
4. Step 4: Simplify right side
   13,196.81x = 142,335,331.20
5. Step 5: Solve for x
   x = 142,335,331.20/13,196.81
6. Step 6: Final answer
   x = 10,785.59