Finding the Fourth Proportional to 13,706.69, 18,915.20 and 7,419.07

Step by Step Solution

1. Step 1: Write the proportion equation
   13,706.69 : 18,915.20 = 7,419.07 : x
2. Step 2: Convert to fraction form
   13,706.69/18,915.20 = 7,419.07/x
3. Step 3: Cross multiply
   13,706.69x = 18,915.20 × 7,419.07
4. Step 4: Simplify right side
   13,706.69x = 140,333,192.86
5. Step 5: Solve for x
   x = 140,333,192.86/13,706.69
6. Step 6: Final answer
   x = 10,238.30