Finding the Fourth Proportional to 2,576.81, 3,861.72 and 1,187.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,576.81 : 3,861.72 = 1,187.09 : x
2. Step 2: Convert to fraction form
   2,576.81/3,861.72 = 1,187.09/x
3. Step 3: Cross multiply
   2,576.81x = 3,861.72 × 1,187.09
4. Step 4: Simplify right side
   2,576.81x = 4,584,209.19
5. Step 5: Solve for x
   x = 4,584,209.19/2,576.81
6. Step 6: Final answer
   x = 1,779.02