Finding the Fourth Proportional to 1,542.16, 2,128.16 and 879.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,542.16 : 2,128.16 = 879.04 : x
2. Step 2: Convert to fraction form
   1,542.16/2,128.16 = 879.04/x
3. Step 3: Cross multiply
   1,542.16x = 2,128.16 × 879.04
4. Step 4: Simplify right side
   1,542.16x = 1,870,737.77
5. Step 5: Solve for x
   x = 1,870,737.77/1,542.16
6. Step 6: Final answer
   x = 1,213.06