Finding the Fourth Proportional to 13,613.23, 18,785.59 and 7,645.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,613.23 : 18,785.59 = 7,645.15 : x
2. Step 2: Convert to fraction form
   13,613.23/18,785.59 = 7,645.15/x
3. Step 3: Cross multiply
   13,613.23x = 18,785.59 × 7,645.15
4. Step 4: Simplify right side
   13,613.23x = 143,618,653.39
5. Step 5: Solve for x
   x = 143,618,653.39/13,613.23
6. Step 6: Final answer
   x = 10,549.93