Finding the Fourth Proportional to 3,876.72, 5,814.90 and 1,279.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,876.72 : 5,814.90 = 1,279.50 : x
2. Step 2: Convert to fraction form
   3,876.72/5,814.90 = 1,279.50/x
3. Step 3: Cross multiply
   3,876.72x = 5,814.90 × 1,279.50
4. Step 4: Simplify right side
   3,876.72x = 7,440,164.55
5. Step 5: Solve for x
   x = 7,440,164.55/3,876.72
6. Step 6: Final answer
   x = 1,919.19