Finding the Fourth Proportional to 2,611.87, 3,919.29 and 1,224.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.87 : 3,919.29 = 1,224.72 : x
2. Step 2: Convert to fraction form
   2,611.87/3,919.29 = 1,224.72/x
3. Step 3: Cross multiply
   2,611.87x = 3,919.29 × 1,224.72
4. Step 4: Simplify right side
   2,611.87x = 4,800,028.26
5. Step 5: Solve for x
   x = 4,800,028.26/2,611.87
6. Step 6: Final answer
   x = 1,837.77