Finding the Fourth Proportional to 1,431.50, 1,974.80 and 933.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.50 : 1,974.80 = 933.95 : x
2. Step 2: Convert to fraction form
   1,431.50/1,974.80 = 933.95/x
3. Step 3: Cross multiply
   1,431.50x = 1,974.80 × 933.95
4. Step 4: Simplify right side
   1,431.50x = 1,844,371.73
5. Step 5: Solve for x
   x = 1,844,371.73/1,431.50
6. Step 6: Final answer
   x = 1,288.42