Finding the Fourth Proportional to 2,513.82, 3,771.21 and 870.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,513.82 : 3,771.21 = 870.30 : x
2. Step 2: Convert to fraction form
   2,513.82/3,771.21 = 870.30/x
3. Step 3: Cross multiply
   2,513.82x = 3,771.21 × 870.30
4. Step 4: Simplify right side
   2,513.82x = 3,282,084.06
5. Step 5: Solve for x
   x = 3,282,084.06/2,513.82
6. Step 6: Final answer
   x = 1,305.62