Finding the Fourth Proportional to 1,686.15, 2,326.59 and 940.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,686.15 : 2,326.59 = 940.05 : x
2. Step 2: Convert to fraction form
   1,686.15/2,326.59 = 940.05/x
3. Step 3: Cross multiply
   1,686.15x = 2,326.59 × 940.05
4. Step 4: Simplify right side
   1,686.15x = 2,187,110.93
5. Step 5: Solve for x
   x = 2,187,110.93/1,686.15
6. Step 6: Final answer
   x = 1,297.10