Finding the Fourth Proportional to 1,541.42, 2,127.33 and 878.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,541.42 : 2,127.33 = 878.30 : x
2. Step 2: Convert to fraction form
   1,541.42/2,127.33 = 878.30/x
3. Step 3: Cross multiply
   1,541.42x = 2,127.33 × 878.30
4. Step 4: Simplify right side
   1,541.42x = 1,868,433.94
5. Step 5: Solve for x
   x = 1,868,433.94/1,541.42
6. Step 6: Final answer
   x = 1,212.15