Finding the Fourth Proportional to 10,641.36, 15,971.89 and 5,380.08

Step by Step Solution

1. Step 1: Write the proportion equation
   10,641.36 : 15,971.89 = 5,380.08 : x
2. Step 2: Convert to fraction form
   10,641.36/15,971.89 = 5,380.08/x
3. Step 3: Cross multiply
   10,641.36x = 15,971.89 × 5,380.08
4. Step 4: Simplify right side
   10,641.36x = 85,930,112.57
5. Step 5: Solve for x
   x = 85,930,112.57/10,641.36
6. Step 6: Final answer
   x = 8,075.10