Finding the Fourth Proportional to 12,786.72, 17,646.48 and 7,198.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,786.72 : 17,646.48 = 7,198.08 : x
2. Step 2: Convert to fraction form
   12,786.72/17,646.48 = 7,198.08/x
3. Step 3: Cross multiply
   12,786.72x = 17,646.48 × 7,198.08
4. Step 4: Simplify right side
   12,786.72x = 127,020,774.76
5. Step 5: Solve for x
   x = 127,020,774.76/12,786.72
6. Step 6: Final answer
   x = 9,933.80