Finding the Fourth Proportional to 1,542.22, 2,128.27 and 879.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,542.22 : 2,128.27 = 879.10 : x
2. Step 2: Convert to fraction form
   1,542.22/2,128.27 = 879.10/x
3. Step 3: Cross multiply
   1,542.22x = 2,128.27 × 879.10
4. Step 4: Simplify right side
   1,542.22x = 1,870,962.16
5. Step 5: Solve for x
   x = 1,870,962.16/1,542.22
6. Step 6: Final answer
   x = 1,213.16