Finding the Fourth Proportional to 1,574.38, 2,172.02 and 911.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,574.38 : 2,172.02 = 911.12 : x
2. Step 2: Convert to fraction form
   1,574.38/2,172.02 = 911.12/x
3. Step 3: Cross multiply
   1,574.38x = 2,172.02 × 911.12
4. Step 4: Simplify right side
   1,574.38x = 1,978,970.86
5. Step 5: Solve for x
   x = 1,978,970.86/1,574.38
6. Step 6: Final answer
   x = 1,256.98