Finding the Fourth Proportional to 2,611.16, 3,916.79 and 1,223.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.16 : 3,916.79 = 1,223.74 : x
2. Step 2: Convert to fraction form
   2,611.16/3,916.79 = 1,223.74/x
3. Step 3: Cross multiply
   2,611.16x = 3,916.79 × 1,223.74
4. Step 4: Simplify right side
   2,611.16x = 4,793,106.89
5. Step 5: Solve for x
   x = 4,793,106.89/2,611.16
6. Step 6: Final answer
   x = 1,835.62