Finding the Fourth Proportional to 2,611.69, 3,917.54 and 1,072.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,611.69 : 3,917.54 = 1,072.69 : x
2. Step 2: Convert to fraction form
   2,611.69/3,917.54 = 1,072.69/x
3. Step 3: Cross multiply
   2,611.69x = 3,917.54 × 1,072.69
4. Step 4: Simplify right side
   2,611.69x = 4,202,298.87
5. Step 5: Solve for x
   x = 4,202,298.87/2,611.69
6. Step 6: Final answer
   x = 1,609.04