Finding the Fourth Proportional to 13,707.41, 18,916.25 and 7,419.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,707.41 : 18,916.25 = 7,419.78 : x
2. Step 2: Convert to fraction form
   13,707.41/18,916.25 = 7,419.78/x
3. Step 3: Cross multiply
   13,707.41x = 18,916.25 × 7,419.78
4. Step 4: Simplify right side
   13,707.41x = 140,354,376.33
5. Step 5: Solve for x
   x = 140,354,376.33/13,707.41
6. Step 6: Final answer
   x = 10,239.31