Finding the Fourth Proportional to 10,978.05, 16,467.05 and 8,482.87

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.05 : 16,467.05 = 8,482.87 : x
2. Step 2: Convert to fraction form
   10,978.05/16,467.05 = 8,482.87/x
3. Step 3: Cross multiply
   10,978.05x = 16,467.05 × 8,482.87
4. Step 4: Simplify right side
   10,978.05x = 139,687,762.10
5. Step 5: Solve for x
   x = 139,687,762.10/10,978.05
6. Step 6: Final answer
   x = 12,724.28