Finding the Fourth Proportional to 1,380.66, 1,904.98 and 933.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.66 : 1,904.98 = 933.36 : x
2. Step 2: Convert to fraction form
   1,380.66/1,904.98 = 933.36/x
3. Step 3: Cross multiply
   1,380.66x = 1,904.98 × 933.36
4. Step 4: Simplify right side
   1,380.66x = 1,778,040.44
5. Step 5: Solve for x
   x = 1,778,040.44/1,380.66
6. Step 6: Final answer
   x = 1,287.82