Finding the Fourth Proportional to 1,542.06, 2,128.06 and 878.97

Step by Step Solution

1. Step 1: Write the proportion equation
   1,542.06 : 2,128.06 = 878.97 : x
2. Step 2: Convert to fraction form
   1,542.06/2,128.06 = 878.97/x
3. Step 3: Cross multiply
   1,542.06x = 2,128.06 × 878.97
4. Step 4: Simplify right side
   1,542.06x = 1,870,509.98
5. Step 5: Solve for x
   x = 1,870,509.98/1,542.06
6. Step 6: Final answer
   x = 1,212.99