Finding the Fourth Proportional to 1,424.15, 1,964.52 and 899.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,424.15 : 1,964.52 = 899.27 : x
2. Step 2: Convert to fraction form
   1,424.15/1,964.52 = 899.27/x
3. Step 3: Cross multiply
   1,424.15x = 1,964.52 × 899.27
4. Step 4: Simplify right side
   1,424.15x = 1,766,633.90
5. Step 5: Solve for x
   x = 1,766,633.90/1,424.15
6. Step 6: Final answer
   x = 1,240.48