Finding the Fourth Proportional to 12,380.48, 18,539.96 and 8,665.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,380.48 : 18,539.96 = 8,665.31 : x
2. Step 2: Convert to fraction form
   12,380.48/18,539.96 = 8,665.31/x
3. Step 3: Cross multiply
   12,380.48x = 18,539.96 × 8,665.31
4. Step 4: Simplify right side
   12,380.48x = 160,654,503.81
5. Step 5: Solve for x
   x = 160,654,503.81/12,380.48
6. Step 6: Final answer
   x = 12,976.44