Finding the Fourth Proportional to 1,047.42, 1,443.42 and 900

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.42 : 1,443.42 = 900 : x
2. Step 2: Convert to fraction form
   1,047.42/1,443.42 = 900/x
3. Step 3: Cross multiply
   1,047.42x = 1,443.42 × 900
4. Step 4: Simplify right side
   1,047.42x = 1,299,078
5. Step 5: Solve for x
   x = 1,299,078/1,047.42
6. Step 6: Final answer
   x = 1,240.26