Finding the Fourth Proportional to 1,016.71, 1,527.35 and 878.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.71 : 1,527.35 = 878.31 : x
2. Step 2: Convert to fraction form
   1,016.71/1,527.35 = 878.31/x
3. Step 3: Cross multiply
   1,016.71x = 1,527.35 × 878.31
4. Step 4: Simplify right side
   1,016.71x = 1,341,486.78
5. Step 5: Solve for x
   x = 1,341,486.78/1,016.71
6. Step 6: Final answer
   x = 1,319.44