Finding the Fourth Proportional to 13,200.73, 18,216.57 and 7,892.80

Step by Step Solution

1. Step 1: Write the proportion equation
   13,200.73 : 18,216.57 = 7,892.80 : x
2. Step 2: Convert to fraction form
   13,200.73/18,216.57 = 7,892.80/x
3. Step 3: Cross multiply
   13,200.73x = 18,216.57 × 7,892.80
4. Step 4: Simplify right side
   13,200.73x = 143,779,743.70
5. Step 5: Solve for x
   x = 143,779,743.70/13,200.73
6. Step 6: Final answer
   x = 10,891.80