Finding the Fourth Proportional to 13,910.79, 19,196.96 and 7,623.21

Step by Step Solution

1. Step 1: Write the proportion equation
   13,910.79 : 19,196.96 = 7,623.21 : x
2. Step 2: Convert to fraction form
   13,910.79/19,196.96 = 7,623.21/x
3. Step 3: Cross multiply
   13,910.79x = 19,196.96 × 7,623.21
4. Step 4: Simplify right side
   13,910.79x = 146,342,419.33
5. Step 5: Solve for x
   x = 146,342,419.33/13,910.79
6. Step 6: Final answer
   x = 10,520.07