Finding the Fourth Proportional to 13,709.72, 18,919.41 and 7,422.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,709.72 : 18,919.41 = 7,422.09 : x
2. Step 2: Convert to fraction form
   13,709.72/18,919.41 = 7,422.09/x
3. Step 3: Cross multiply
   13,709.72x = 18,919.41 × 7,422.09
4. Step 4: Simplify right side
   13,709.72x = 140,421,563.77
5. Step 5: Solve for x
   x = 140,421,563.77/13,709.72
6. Step 6: Final answer
   x = 10,242.48