Finding the Fourth Proportional to 11,978.92, 16,526.46 and 8,445.16

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978.92 : 16,526.46 = 8,445.16 : x
2. Step 2: Convert to fraction form
   11,978.92/16,526.46 = 8,445.16/x
3. Step 3: Cross multiply
   11,978.92x = 16,526.46 × 8,445.16
4. Step 4: Simplify right side
   11,978.92x = 139,568,598.93
5. Step 5: Solve for x
   x = 139,568,598.93/11,978.92
6. Step 6: Final answer
   x = 11,651.18