Finding the Fourth Proportional to 1,439.97, 1,987.50 and 850.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.97 : 1,987.50 = 850.83 : x
2. Step 2: Convert to fraction form
   1,439.97/1,987.50 = 850.83/x
3. Step 3: Cross multiply
   1,439.97x = 1,987.50 × 850.83
4. Step 4: Simplify right side
   1,439.97x = 1,691,024.63
5. Step 5: Solve for x
   x = 1,691,024.63/1,439.97
6. Step 6: Final answer
   x = 1,174.35