Finding the Fourth Proportional to 2,513.72, 3,771.50 and 870.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,513.72 : 3,771.50 = 870.44 : x
2. Step 2: Convert to fraction form
   2,513.72/3,771.50 = 870.44/x
3. Step 3: Cross multiply
   2,513.72x = 3,771.50 × 870.44
4. Step 4: Simplify right side
   2,513.72x = 3,282,864.46
5. Step 5: Solve for x
   x = 3,282,864.46/2,513.72
6. Step 6: Final answer
   x = 1,305.98