Finding the Fourth Proportional to 2,513.67, 3,770.87 and 869.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,513.67 : 3,770.87 = 869.91 : x
2. Step 2: Convert to fraction form
   2,513.67/3,770.87 = 869.91/x
3. Step 3: Cross multiply
   2,513.67x = 3,770.87 × 869.91
4. Step 4: Simplify right side
   2,513.67x = 3,280,313.17
5. Step 5: Solve for x
   x = 3,280,313.17/2,513.67
6. Step 6: Final answer
   x = 1,304.99