Finding the Fourth Proportional to 1,438.61, 1,985.04 and 849.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.61 : 1,985.04 = 849.20 : x
2. Step 2: Convert to fraction form
   1,438.61/1,985.04 = 849.20/x
3. Step 3: Cross multiply
   1,438.61x = 1,985.04 × 849.20
4. Step 4: Simplify right side
   1,438.61x = 1,685,686.04
5. Step 5: Solve for x
   x = 1,685,686.04/1,438.61
6. Step 6: Final answer
   x = 1,171.75