Finding the Fourth Proportional to 1,393.79, 1,923.62 and 862.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.79 : 1,923.62 = 862.84 : x
2. Step 2: Convert to fraction form
   1,393.79/1,923.62 = 862.84/x
3. Step 3: Cross multiply
   1,393.79x = 1,923.62 × 862.84
4. Step 4: Simplify right side
   1,393.79x = 1,659,769.19
5. Step 5: Solve for x
   x = 1,659,769.19/1,393.79
6. Step 6: Final answer
   x = 1,190.84