Finding the Fourth Proportional to 1,686.78, 2,327.69 and 940.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,686.78 : 2,327.69 = 940.71 : x
2. Step 2: Convert to fraction form
   1,686.78/2,327.69 = 940.71/x
3. Step 3: Cross multiply
   1,686.78x = 2,327.69 × 940.71
4. Step 4: Simplify right side
   1,686.78x = 2,189,681.26
5. Step 5: Solve for x
   x = 2,189,681.26/1,686.78
6. Step 6: Final answer
   x = 1,298.14