Finding the Fourth Proportional to 1,438.87, 1,985.37 and 849.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.87 : 1,985.37 = 849.31 : x
2. Step 2: Convert to fraction form
   1,438.87/1,985.37 = 849.31/x
3. Step 3: Cross multiply
   1,438.87x = 1,985.37 × 849.31
4. Step 4: Simplify right side
   1,438.87x = 1,686,194.59
5. Step 5: Solve for x
   x = 1,686,194.59/1,438.87
6. Step 6: Final answer
   x = 1,171.89