Finding the Fourth Proportional to 10,641.10, 15,971.49 and 5,379.81

Step by Step Solution

1. Step 1: Write the proportion equation
   10,641.10 : 15,971.49 = 5,379.81 : x
2. Step 2: Convert to fraction form
   10,641.10/15,971.49 = 5,379.81/x
3. Step 3: Cross multiply
   10,641.10x = 15,971.49 × 5,379.81
4. Step 4: Simplify right side
   10,641.10x = 85,923,554.72
5. Step 5: Solve for x
   x = 85,923,554.72/10,641.10
6. Step 6: Final answer
   x = 8,074.69