Finding the Fourth Proportional to 12,916.69, 17,820.45 and 8,443.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,916.69 : 17,820.45 = 8,443.04 : x
2. Step 2: Convert to fraction form
   12,916.69/17,820.45 = 8,443.04/x
3. Step 3: Cross multiply
   12,916.69x = 17,820.45 × 8,443.04
4. Step 4: Simplify right side
   12,916.69x = 150,458,683.07
5. Step 5: Solve for x
   x = 150,458,683.07/12,916.69
6. Step 6: Final answer
   x = 11,648.40