Finding the Fourth Proportional to 6,441.78, 8,889.69 and 3,609.15

Step by Step Solution

1. Step 1: Write the proportion equation
   6,441.78 : 8,889.69 = 3,609.15 : x
2. Step 2: Convert to fraction form
   6,441.78/8,889.69 = 3,609.15/x
3. Step 3: Cross multiply
   6,441.78x = 8,889.69 × 3,609.15
4. Step 4: Simplify right side
   6,441.78x = 32,084,224.66
5. Step 5: Solve for x
   x = 32,084,224.66/6,441.78
6. Step 6: Final answer
   x = 4,980.65