Finding the Fourth Proportional to 11,830.72, 17,721.12 and 7,136.16

Step by Step Solution

1. Step 1: Write the proportion equation
   11,830.72 : 17,721.12 = 7,136.16 : x
2. Step 2: Convert to fraction form
   11,830.72/17,721.12 = 7,136.16/x
3. Step 3: Cross multiply
   11,830.72x = 17,721.12 × 7,136.16
4. Step 4: Simplify right side
   11,830.72x = 126,460,747.70
5. Step 5: Solve for x
   x = 126,460,747.70/11,830.72
6. Step 6: Final answer
   x = 10,689.18