Finding the Fourth Proportional to 13,725.72, 18,941.49 and 7,438.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,725.72 : 18,941.49 = 7,438.09 : x
2. Step 2: Convert to fraction form
   13,725.72/18,941.49 = 7,438.09/x
3. Step 3: Cross multiply
   13,725.72x = 18,941.49 × 7,438.09
4. Step 4: Simplify right side
   13,725.72x = 140,888,507.35
5. Step 5: Solve for x
   x = 140,888,507.35/13,725.72
6. Step 6: Final answer
   x = 10,264.56