Finding the Fourth Proportional to 2,575.10, 3,861.27 and 1,187.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,575.10 : 3,861.27 = 1,187.72 : x
2. Step 2: Convert to fraction form
   2,575.10/3,861.27 = 1,187.72/x
3. Step 3: Cross multiply
   2,575.10x = 3,861.27 × 1,187.72
4. Step 4: Simplify right side
   2,575.10x = 4,586,091.27
5. Step 5: Solve for x
   x = 4,586,091.27/2,575.10
6. Step 6: Final answer
   x = 1,780.94