Finding the Fourth Proportional to 1,429.33, 1,972.65 and 839.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.33 : 1,972.65 = 839.92 : x
2. Step 2: Convert to fraction form
   1,429.33/1,972.65 = 839.92/x
3. Step 3: Cross multiply
   1,429.33x = 1,972.65 × 839.92
4. Step 4: Simplify right side
   1,429.33x = 1,656,868.19
5. Step 5: Solve for x
   x = 1,656,868.19/1,429.33
6. Step 6: Final answer
   x = 1,159.19