Finding the Fourth Proportional to 1,371.23, 1,891.42 and 899.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.23 : 1,891.42 = 899.15 : x
2. Step 2: Convert to fraction form
   1,371.23/1,891.42 = 899.15/x
3. Step 3: Cross multiply
   1,371.23x = 1,891.42 × 899.15
4. Step 4: Simplify right side
   1,371.23x = 1,700,673.90
5. Step 5: Solve for x
   x = 1,700,673.90/1,371.23
6. Step 6: Final answer
   x = 1,240.26