Finding the Fourth Proportional to 2,512.98, 3,770.61 and 870.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,512.98 : 3,770.61 = 870.72 : x
2. Step 2: Convert to fraction form
   2,512.98/3,770.61 = 870.72/x
3. Step 3: Cross multiply
   2,512.98x = 3,770.61 × 870.72
4. Step 4: Simplify right side
   2,512.98x = 3,283,145.54
5. Step 5: Solve for x
   x = 3,283,145.54/2,512.98
6. Step 6: Final answer
   x = 1,306.47