Finding the Fourth Proportional to 13,707.61, 18,916.50 and 7,419.97

Step by Step Solution

1. Step 1: Write the proportion equation
   13,707.61 : 18,916.50 = 7,419.97 : x
2. Step 2: Convert to fraction form
   13,707.61/18,916.50 = 7,419.97/x
3. Step 3: Cross multiply
   13,707.61x = 18,916.50 × 7,419.97
4. Step 4: Simplify right side
   13,707.61x = 140,359,862.51
5. Step 5: Solve for x
   x = 140,359,862.51/13,707.61
6. Step 6: Final answer
   x = 10,239.56