Finding the Fourth Proportional to 13,709.93, 18,919.71 and 7,422.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,709.93 : 18,919.71 = 7,422.31 : x
2. Step 2: Convert to fraction form
   13,709.93/18,919.71 = 7,422.31/x
3. Step 3: Cross multiply
   13,709.93x = 18,919.71 × 7,422.31
4. Step 4: Simplify right side
   13,709.93x = 140,427,952.73
5. Step 5: Solve for x
   x = 140,427,952.73/13,709.93
6. Step 6: Final answer
   x = 10,242.79