Finding the Fourth Proportional to 1,438.95, 1,985.06 and 849.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.95 : 1,985.06 = 849.15 : x
2. Step 2: Convert to fraction form
   1,438.95/1,985.06 = 849.15/x
3. Step 3: Cross multiply
   1,438.95x = 1,985.06 × 849.15
4. Step 4: Simplify right side
   1,438.95x = 1,685,613.70
5. Step 5: Solve for x
   x = 1,685,613.70/1,438.95
6. Step 6: Final answer
   x = 1,171.42