Finding the Fourth Proportional to 11,987.98, 17,972.69 and 8,279.49

Step by Step Solution

1. Step 1: Write the proportion equation
   11,987.98 : 17,972.69 = 8,279.49 : x
2. Step 2: Convert to fraction form
   11,987.98/17,972.69 = 8,279.49/x
3. Step 3: Cross multiply
   11,987.98x = 17,972.69 × 8,279.49
4. Step 4: Simplify right side
   11,987.98x = 148,804,727.83
5. Step 5: Solve for x
   x = 148,804,727.83/11,987.98
6. Step 6: Final answer
   x = 12,412.83