Finding the Fourth Proportional to 1,399.94, 1,931.93 and 778.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.94 : 1,931.93 = 778.94 : x
2. Step 2: Convert to fraction form
   1,399.94/1,931.93 = 778.94/x
3. Step 3: Cross multiply
   1,399.94x = 1,931.93 × 778.94
4. Step 4: Simplify right side
   1,399.94x = 1,504,857.55
5. Step 5: Solve for x
   x = 1,504,857.55/1,399.94
6. Step 6: Final answer
   x = 1,074.94