Finding the Fourth Proportional to 2,611.62, 3,914.69 and 1,223.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.62 : 3,914.69 = 1,223.79 : x
2. Step 2: Convert to fraction form
   2,611.62/3,914.69 = 1,223.79/x
3. Step 3: Cross multiply
   2,611.62x = 3,914.69 × 1,223.79
4. Step 4: Simplify right side
   2,611.62x = 4,790,758.48
5. Step 5: Solve for x
   x = 4,790,758.48/2,611.62
6. Step 6: Final answer
   x = 1,834.40