Finding the Fourth Proportional to 11,805.48, 16,290.72 and 6,499.80

Step by Step Solution

1. Step 1: Write the proportion equation
   11,805.48 : 16,290.72 = 6,499.80 : x
2. Step 2: Convert to fraction form
   11,805.48/16,290.72 = 6,499.80/x
3. Step 3: Cross multiply
   11,805.48x = 16,290.72 × 6,499.80
4. Step 4: Simplify right side
   11,805.48x = 105,886,421.86
5. Step 5: Solve for x
   x = 105,886,421.86/11,805.48
6. Step 6: Final answer
   x = 8,969.26