Finding the Fourth Proportional to 1,429.27, 1,972.29 and 839.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.27 : 1,972.29 = 839.73 : x
2. Step 2: Convert to fraction form
   1,429.27/1,972.29 = 839.73/x
3. Step 3: Cross multiply
   1,429.27x = 1,972.29 × 839.73
4. Step 4: Simplify right side
   1,429.27x = 1,656,191.08
5. Step 5: Solve for x
   x = 1,656,191.08/1,429.27
6. Step 6: Final answer
   x = 1,158.77