Finding the Fourth Proportional to 8,456.22, 12,694.05 and 5,190.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,456.22 : 12,694.05 = 5,190.30 : x
2. Step 2: Convert to fraction form
   8,456.22/12,694.05 = 5,190.30/x
3. Step 3: Cross multiply
   8,456.22x = 12,694.05 × 5,190.30
4. Step 4: Simplify right side
   8,456.22x = 65,885,927.72
5. Step 5: Solve for x
   x = 65,885,927.72/8,456.22
6. Step 6: Final answer
   x = 7,791.42