Finding the Fourth Proportional to 10,976.08, 16,427.16 and 8,111.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,976.08 : 16,427.16 = 8,111.12 : x
2. Step 2: Convert to fraction form
   10,976.08/16,427.16 = 8,111.12/x
3. Step 3: Cross multiply
   10,976.08x = 16,427.16 × 8,111.12
4. Step 4: Simplify right side
   10,976.08x = 133,242,666.02
5. Step 5: Solve for x
   x = 133,242,666.02/10,976.08
6. Step 6: Final answer
   x = 12,139.37