Finding the Fourth Proportional to 1,542.27, 2,128.50 and 879.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,542.27 : 2,128.50 = 879.24 : x
2. Step 2: Convert to fraction form
   1,542.27/2,128.50 = 879.24/x
3. Step 3: Cross multiply
   1,542.27x = 2,128.50 × 879.24
4. Step 4: Simplify right side
   1,542.27x = 1,871,462.34
5. Step 5: Solve for x
   x = 1,871,462.34/1,542.27
6. Step 6: Final answer
   x = 1,213.45