Finding the Fourth Proportional to 12,445.38, 18,671.72 and 3,680.53

Step by Step Solution

1. Step 1: Write the proportion equation
   12,445.38 : 18,671.72 = 3,680.53 : x
2. Step 2: Convert to fraction form
   12,445.38/18,671.72 = 3,680.53/x
3. Step 3: Cross multiply
   12,445.38x = 18,671.72 × 3,680.53
4. Step 4: Simplify right side
   12,445.38x = 68,721,760.53
5. Step 5: Solve for x
   x = 68,721,760.53/12,445.38
6. Step 6: Final answer
   x = 5,521.87