Finding the Fourth Proportional to 1,429.25, 1,972.07 and 839.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.25 : 1,972.07 = 839.57 : x
2. Step 2: Convert to fraction form
   1,429.25/1,972.07 = 839.57/x
3. Step 3: Cross multiply
   1,429.25x = 1,972.07 × 839.57
4. Step 4: Simplify right side
   1,429.25x = 1,655,691.54
5. Step 5: Solve for x
   x = 1,655,691.54/1,429.25
6. Step 6: Final answer
   x = 1,158.43