Finding the Fourth Proportional to 12,478.92, 17,226.45 and 7,766.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,478.92 : 17,226.45 = 7,766.34 : x
2. Step 2: Convert to fraction form
   12,478.92/17,226.45 = 7,766.34/x
3. Step 3: Cross multiply
   12,478.92x = 17,226.45 × 7,766.34
4. Step 4: Simplify right side
   12,478.92x = 133,786,467.69
5. Step 5: Solve for x
   x = 133,786,467.69/12,478.92
6. Step 6: Final answer
   x = 10,721.00