Finding the Fourth Proportional to 2,512.77, 3,770.18 and 870.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,512.77 : 3,770.18 = 870.47 : x
2. Step 2: Convert to fraction form
   2,512.77/3,770.18 = 870.47/x
3. Step 3: Cross multiply
   2,512.77x = 3,770.18 × 870.47
4. Step 4: Simplify right side
   2,512.77x = 3,281,805.38
5. Step 5: Solve for x
   x = 3,281,805.38/2,512.77
6. Step 6: Final answer
   x = 1,306.05