Finding the Fourth Proportional to 12,390.56, 17,098.80 and 7,676

Step by Step Solution

1. Step 1: Write the proportion equation
   12,390.56 : 17,098.80 = 7,676 : x
2. Step 2: Convert to fraction form
   12,390.56/17,098.80 = 7,676/x
3. Step 3: Cross multiply
   12,390.56x = 17,098.80 × 7,676
4. Step 4: Simplify right side
   12,390.56x = 131,250,388.80
5. Step 5: Solve for x
   x = 131,250,388.80/12,390.56
6. Step 6: Final answer
   x = 10,592.77