Finding the Fourth Proportional to 2,513.96, 3,769.72 and 870.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,513.96 : 3,769.72 = 870.60 : x
2. Step 2: Convert to fraction form
   2,513.96/3,769.72 = 870.60/x
3. Step 3: Cross multiply
   2,513.96x = 3,769.72 × 870.60
4. Step 4: Simplify right side
   2,513.96x = 3,281,918.23
5. Step 5: Solve for x
   x = 3,281,918.23/2,513.96
6. Step 6: Final answer
   x = 1,305.48