Finding the Fourth Proportional to 13,193.86, 18,208.90 and 7,819.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,193.86 : 18,208.90 = 7,819.50 : x
2. Step 2: Convert to fraction form
   13,193.86/18,208.90 = 7,819.50/x
3. Step 3: Cross multiply
   13,193.86x = 18,208.90 × 7,819.50
4. Step 4: Simplify right side
   13,193.86x = 142,384,493.55
5. Step 5: Solve for x
   x = 142,384,493.55/13,193.86
6. Step 6: Final answer
   x = 10,791.72