Finding the Fourth Proportional to 2,120.91, 2,926.86 and 1,236.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120.91 : 2,926.86 = 1,236.54 : x
2. Step 2: Convert to fraction form
   2,120.91/2,926.86 = 1,236.54/x
3. Step 3: Cross multiply
   2,120.91x = 2,926.86 × 1,236.54
4. Step 4: Simplify right side
   2,120.91x = 3,619,185.80
5. Step 5: Solve for x
   x = 3,619,185.80/2,120.91
6. Step 6: Final answer
   x = 1,706.43