Finding the Fourth Proportional to 2,613, 3,918.78 and 1,225.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613 : 3,918.78 = 1,225.50 : x
2. Step 2: Convert to fraction form
   2,613/3,918.78 = 1,225.50/x
3. Step 3: Cross multiply
   2,613x = 3,918.78 × 1,225.50
4. Step 4: Simplify right side
   2,613x = 4,802,464.89
5. Step 5: Solve for x
   x = 4,802,464.89/2,613
6. Step 6: Final answer
   x = 1,837.91