Finding the Fourth Proportional to 11,145.72, 15,381.09 and 6,109.89

Step by Step Solution

1. Step 1: Write the proportion equation
   11,145.72 : 15,381.09 = 6,109.89 : x
2. Step 2: Convert to fraction form
   11,145.72/15,381.09 = 6,109.89/x
3. Step 3: Cross multiply
   11,145.72x = 15,381.09 × 6,109.89
4. Step 4: Simplify right side
   11,145.72x = 93,976,767.98
5. Step 5: Solve for x
   x = 93,976,767.98/11,145.72
6. Step 6: Final answer
   x = 8,431.65