Finding the Fourth Proportional to 2,513.64, 3,770.37 and 870.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,513.64 : 3,770.37 = 870.15 : x
2. Step 2: Convert to fraction form
   2,513.64/3,770.37 = 870.15/x
3. Step 3: Cross multiply
   2,513.64x = 3,770.37 × 870.15
4. Step 4: Simplify right side
   2,513.64x = 3,280,787.46
5. Step 5: Solve for x
   x = 3,280,787.46/2,513.64
6. Step 6: Final answer
   x = 1,305.19