Finding the Fourth Proportional to 11,916.43, 17,820.94 and 9,106.09

Step by Step Solution

1. Step 1: Write the proportion equation
   11,916.43 : 17,820.94 = 9,106.09 : x
2. Step 2: Convert to fraction form
   11,916.43/17,820.94 = 9,106.09/x
3. Step 3: Cross multiply
   11,916.43x = 17,820.94 × 9,106.09
4. Step 4: Simplify right side
   11,916.43x = 162,279,050.35
5. Step 5: Solve for x
   x = 162,279,050.35/11,916.43
6. Step 6: Final answer
   x = 13,618.10