Finding the Fourth Proportional to 13,709.94, 18,919.72 and 7,422.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,709.94 : 18,919.72 = 7,422.31 : x
2. Step 2: Convert to fraction form
   13,709.94/18,919.72 = 7,422.31/x
3. Step 3: Cross multiply
   13,709.94x = 18,919.72 × 7,422.31
4. Step 4: Simplify right side
   13,709.94x = 140,427,989.84
5. Step 5: Solve for x
   x = 140,427,989.84/13,709.94
6. Step 6: Final answer
   x = 10,242.79