Finding the Fourth Proportional to 1,394.20, 1,924.83 and 870.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,394.20 : 1,924.83 = 870.94 : x
2. Step 2: Convert to fraction form
   1,394.20/1,924.83 = 870.94/x
3. Step 3: Cross multiply
   1,394.20x = 1,924.83 × 870.94
4. Step 4: Simplify right side
   1,394.20x = 1,676,419.52
5. Step 5: Solve for x
   x = 1,676,419.52/1,394.20
6. Step 6: Final answer
   x = 1,202.42