Finding the Fourth Proportional to 8,129.69, 12,196.23 and 4,621.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,129.69 : 12,196.23 = 4,621.31 : x
2. Step 2: Convert to fraction form
   8,129.69/12,196.23 = 4,621.31/x
3. Step 3: Cross multiply
   8,129.69x = 12,196.23 × 4,621.31
4. Step 4: Simplify right side
   8,129.69x = 56,362,475.57
5. Step 5: Solve for x
   x = 56,362,475.57/8,129.69
6. Step 6: Final answer
   x = 6,932.92