Finding the Fourth Proportional to 1,158.28, 1,598.94 and 878.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.28 : 1,598.94 = 878.56 : x
2. Step 2: Convert to fraction form
   1,158.28/1,598.94 = 878.56/x
3. Step 3: Cross multiply
   1,158.28x = 1,598.94 × 878.56
4. Step 4: Simplify right side
   1,158.28x = 1,404,764.73
5. Step 5: Solve for x
   x = 1,404,764.73/1,158.28
6. Step 6: Final answer
   x = 1,212.80