Finding the Fourth Proportional to 1,399.50, 1,931.72 and 933.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.50 : 1,931.72 = 933.75 : x
2. Step 2: Convert to fraction form
   1,399.50/1,931.72 = 933.75/x
3. Step 3: Cross multiply
   1,399.50x = 1,931.72 × 933.75
4. Step 4: Simplify right side
   1,399.50x = 1,803,738.88
5. Step 5: Solve for x
   x = 1,803,738.88/1,399.50
6. Step 6: Final answer
   x = 1,288.85