Finding the Fourth Proportional to 3,608.48, 4,978.96 and 2,116.64

Step by Step Solution

1. Step 1: Write the proportion equation
   3,608.48 : 4,978.96 = 2,116.64 : x
2. Step 2: Convert to fraction form
   3,608.48/4,978.96 = 2,116.64/x
3. Step 3: Cross multiply
   3,608.48x = 4,978.96 × 2,116.64
4. Step 4: Simplify right side
   3,608.48x = 10,538,665.89
5. Step 5: Solve for x
   x = 10,538,665.89/3,608.48
6. Step 6: Final answer
   x = 2,920.53