Finding the Fourth Proportional to 13,710.05, 18,919.78 and 7,422.38

Step by Step Solution

1. Step 1: Write the proportion equation
   13,710.05 : 18,919.78 = 7,422.38 : x
2. Step 2: Convert to fraction form
   13,710.05/18,919.78 = 7,422.38/x
3. Step 3: Cross multiply
   13,710.05x = 18,919.78 × 7,422.38
4. Step 4: Simplify right side
   13,710.05x = 140,429,683.52
5. Step 5: Solve for x
   x = 140,429,683.52/13,710.05
6. Step 6: Final answer
   x = 10,242.83