Finding the Fourth Proportional to 1,399.44, 1,931.06 and 839.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.44 : 1,931.06 = 839.93 : x
2. Step 2: Convert to fraction form
   1,399.44/1,931.06 = 839.93/x
3. Step 3: Cross multiply
   1,399.44x = 1,931.06 × 839.93
4. Step 4: Simplify right side
   1,399.44x = 1,621,955.23
5. Step 5: Solve for x
   x = 1,621,955.23/1,399.44
6. Step 6: Final answer
   x = 1,159.00