Finding the Fourth Proportional to 1,429.37, 1,972.16 and 839.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.37 : 1,972.16 = 839.79 : x
2. Step 2: Convert to fraction form
   1,429.37/1,972.16 = 839.79/x
3. Step 3: Cross multiply
   1,429.37x = 1,972.16 × 839.79
4. Step 4: Simplify right side
   1,429.37x = 1,656,196.05
5. Step 5: Solve for x
   x = 1,656,196.05/1,429.37
6. Step 6: Final answer
   x = 1,158.69