Finding the Fourth Proportional to 2,618.81, 3,926.76 and 1,211.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.81 : 3,926.76 = 1,211.69 : x
2. Step 2: Convert to fraction form
   2,618.81/3,926.76 = 1,211.69/x
3. Step 3: Cross multiply
   2,618.81x = 3,926.76 × 1,211.69
4. Step 4: Simplify right side
   2,618.81x = 4,758,015.82
5. Step 5: Solve for x
   x = 4,758,015.82/2,618.81
6. Step 6: Final answer
   x = 1,816.86