Finding the Fourth Proportional to 12,720.39, 17,554.62 and 7,055.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,720.39 : 17,554.62 = 7,055.15 : x
2. Step 2: Convert to fraction form
   12,720.39/17,554.62 = 7,055.15/x
3. Step 3: Cross multiply
   12,720.39x = 17,554.62 × 7,055.15
4. Step 4: Simplify right side
   12,720.39x = 123,850,514.72
5. Step 5: Solve for x
   x = 123,850,514.72/12,720.39
6. Step 6: Final answer
   x = 9,736.38