Finding the Fourth Proportional to 13,199.98, 18,215.52 and 7,892.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,199.98 : 18,215.52 = 7,892.05 : x
2. Step 2: Convert to fraction form
   13,199.98/18,215.52 = 7,892.05/x
3. Step 3: Cross multiply
   13,199.98x = 18,215.52 × 7,892.05
4. Step 4: Simplify right side
   13,199.98x = 143,757,794.62
5. Step 5: Solve for x
   x = 143,757,794.62/13,199.98
6. Step 6: Final answer
   x = 10,890.76