Finding the Fourth Proportional to 2,608.96, 3,912.76 and 1,221.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,608.96 : 3,912.76 = 1,221.58 : x
2. Step 2: Convert to fraction form
   2,608.96/3,912.76 = 1,221.58/x
3. Step 3: Cross multiply
   2,608.96x = 3,912.76 × 1,221.58
4. Step 4: Simplify right side
   2,608.96x = 4,779,748.91
5. Step 5: Solve for x
   x = 4,779,748.91/2,608.96
6. Step 6: Final answer
   x = 1,832.05