Finding the Fourth Proportional to 10,641.42, 15,971.96 and 5,380.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,641.42 : 15,971.96 = 5,380.12 : x
2. Step 2: Convert to fraction form
   10,641.42/15,971.96 = 5,380.12/x
3. Step 3: Cross multiply
   10,641.42x = 15,971.96 × 5,380.12
4. Step 4: Simplify right side
   10,641.42x = 85,931,061.44
5. Step 5: Solve for x
   x = 85,931,061.44/10,641.42
6. Step 6: Final answer
   x = 8,075.15