Finding the Fourth Proportional to 3,608.72, 4,978.62 and 2,116.08

Step by Step Solution

1. Step 1: Write the proportion equation
   3,608.72 : 4,978.62 = 2,116.08 : x
2. Step 2: Convert to fraction form
   3,608.72/4,978.62 = 2,116.08/x
3. Step 3: Cross multiply
   3,608.72x = 4,978.62 × 2,116.08
4. Step 4: Simplify right side
   3,608.72x = 10,535,158.21
5. Step 5: Solve for x
   x = 10,535,158.21/3,608.72
6. Step 6: Final answer
   x = 2,919.37