Finding the Fourth Proportional to 1,429.25, 1,972.40 and 839.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.25 : 1,972.40 = 839.84 : x
2. Step 2: Convert to fraction form
   1,429.25/1,972.40 = 839.84/x
3. Step 3: Cross multiply
   1,429.25x = 1,972.40 × 839.84
4. Step 4: Simplify right side
   1,429.25x = 1,656,486.35
5. Step 5: Solve for x
   x = 1,656,486.35/1,429.25
6. Step 6: Final answer
   x = 1,158.99