Finding the Fourth Proportional to 1,427.58, 2,139.83 and 933.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,427.58 : 2,139.83 = 933.80 : x
2. Step 2: Convert to fraction form
   1,427.58/2,139.83 = 933.80/x
3. Step 3: Cross multiply
   1,427.58x = 2,139.83 × 933.80
4. Step 4: Simplify right side
   1,427.58x = 1,998,173.25
5. Step 5: Solve for x
   x = 1,998,173.25/1,427.58
6. Step 6: Final answer
   x = 1,399.69