Finding the Fourth Proportional to 1,786.72, 2,684.40 and 1,138.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,786.72 : 2,684.40 = 1,138.72 : x
2. Step 2: Convert to fraction form
   1,786.72/2,684.40 = 1,138.72/x
3. Step 3: Cross multiply
   1,786.72x = 2,684.40 × 1,138.72
4. Step 4: Simplify right side
   1,786.72x = 3,056,779.97
5. Step 5: Solve for x
   x = 3,056,779.97/1,786.72
6. Step 6: Final answer
   x = 1,710.83