Finding the Fourth Proportional to 12,369.16, 17,077.35 and 8,127.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,369.16 : 17,077.35 = 8,127.78 : x
2. Step 2: Convert to fraction form
   12,369.16/17,077.35 = 8,127.78/x
3. Step 3: Cross multiply
   12,369.16x = 17,077.35 × 8,127.78
4. Step 4: Simplify right side
   12,369.16x = 138,800,943.78
5. Step 5: Solve for x
   x = 138,800,943.78/12,369.16
6. Step 6: Final answer
   x = 11,221.53