Finding the Fourth Proportional to 1,541.89, 2,128.04 and 878.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,541.89 : 2,128.04 = 878.81 : x
2. Step 2: Convert to fraction form
   1,541.89/2,128.04 = 878.81/x
3. Step 3: Cross multiply
   1,541.89x = 2,128.04 × 878.81
4. Step 4: Simplify right side
   1,541.89x = 1,870,142.83
5. Step 5: Solve for x
   x = 1,870,142.83/1,541.89
6. Step 6: Final answer
   x = 1,212.89