Finding the Fourth Proportional to 1,679.37, 2,317.40 and 933.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,679.37 : 2,317.40 = 933.31 : x
2. Step 2: Convert to fraction form
   1,679.37/2,317.40 = 933.31/x
3. Step 3: Cross multiply
   1,679.37x = 2,317.40 × 933.31
4. Step 4: Simplify right side
   1,679.37x = 2,162,847.93
5. Step 5: Solve for x
   x = 2,162,847.93/1,679.37
6. Step 6: Final answer
   x = 1,287.90