Finding the Fourth Proportional to 1,171.31, 1,614.18 and 839.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.31 : 1,614.18 = 839.16 : x
2. Step 2: Convert to fraction form
   1,171.31/1,614.18 = 839.16/x
3. Step 3: Cross multiply
   1,171.31x = 1,614.18 × 839.16
4. Step 4: Simplify right side
   1,171.31x = 1,354,543.02
5. Step 5: Solve for x
   x = 1,354,543.02/1,171.31
6. Step 6: Final answer
   x = 1,156.44