Finding the Fourth Proportional to 12,612.38, 18,921.54 and 3,847.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,612.38 : 18,921.54 = 3,847.30 : x
2. Step 2: Convert to fraction form
   12,612.38/18,921.54 = 3,847.30/x
3. Step 3: Cross multiply
   12,612.38x = 18,921.54 × 3,847.30
4. Step 4: Simplify right side
   12,612.38x = 72,796,780.91
5. Step 5: Solve for x
   x = 72,796,780.91/12,612.38
6. Step 6: Final answer
   x = 5,771.85