Finding the Fourth Proportional to 1,542.34, 2,128.26 and 912.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,542.34 : 2,128.26 = 912.89 : x
2. Step 2: Convert to fraction form
   1,542.34/2,128.26 = 912.89/x
3. Step 3: Cross multiply
   1,542.34x = 2,128.26 × 912.89
4. Step 4: Simplify right side
   1,542.34x = 1,942,867.27
5. Step 5: Solve for x
   x = 1,942,867.27/1,542.34
6. Step 6: Final answer
   x = 1,259.69