Finding the Fourth Proportional to 13,339.69, 18,407.79 and 7,371.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,339.69 : 18,407.79 = 7,371.47 : x
2. Step 2: Convert to fraction form
   13,339.69/18,407.79 = 7,371.47/x
3. Step 3: Cross multiply
   13,339.69x = 18,407.79 × 7,371.47
4. Step 4: Simplify right side
   13,339.69x = 135,692,517.77
5. Step 5: Solve for x
   x = 135,692,517.77/13,339.69
6. Step 6: Final answer
   x = 10,172.09