Finding the Fourth Proportional to 1,425.98, 2,139.46 and 899.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.98 : 2,139.46 = 899.29 : x
2. Step 2: Convert to fraction form
   1,425.98/2,139.46 = 899.29/x
3. Step 3: Cross multiply
   1,425.98x = 2,139.46 × 899.29
4. Step 4: Simplify right side
   1,425.98x = 1,923,979.79
5. Step 5: Solve for x
   x = 1,923,979.79/1,425.98
6. Step 6: Final answer
   x = 1,349.23