Finding the Fourth Proportional to 12,379.60, 17,084.64 and 8,180.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,379.60 : 17,084.64 = 8,180.56 : x
2. Step 2: Convert to fraction form
   12,379.60/17,084.64 = 8,180.56/x
3. Step 3: Cross multiply
   12,379.60x = 17,084.64 × 8,180.56
4. Step 4: Simplify right side
   12,379.60x = 139,761,922.60
5. Step 5: Solve for x
   x = 139,761,922.60/12,379.60
6. Step 6: Final answer
   x = 11,289.70