Finding the Fourth Proportional to 1,423.38, 1,964.58 and 899.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,423.38 : 1,964.58 = 899.31 : x
2. Step 2: Convert to fraction form
   1,423.38/1,964.58 = 899.31/x
3. Step 3: Cross multiply
   1,423.38x = 1,964.58 × 899.31
4. Step 4: Simplify right side
   1,423.38x = 1,766,766.44
5. Step 5: Solve for x
   x = 1,766,766.44/1,423.38
6. Step 6: Final answer
   x = 1,241.25