Finding the Fourth Proportional to 12,643.48, 17,446.78 and 6,977.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,643.48 : 17,446.78 = 6,977.89 : x
2. Step 2: Convert to fraction form
   12,643.48/17,446.78 = 6,977.89/x
3. Step 3: Cross multiply
   12,643.48x = 17,446.78 × 6,977.89
4. Step 4: Simplify right side
   12,643.48x = 121,741,711.69
5. Step 5: Solve for x
   x = 121,741,711.69/12,643.48
6. Step 6: Final answer
   x = 9,628.81