Finding the Fourth Proportional to 3,872.70, 5,298.17 and 3,861.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,872.70 : 5,298.17 = 3,861.72 : x
2. Step 2: Convert to fraction form
   3,872.70/5,298.17 = 3,861.72/x
3. Step 3: Cross multiply
   3,872.70x = 5,298.17 × 3,861.72
4. Step 4: Simplify right side
   3,872.70x = 20,460,029.74
5. Step 5: Solve for x
   x = 20,460,029.74/3,872.70
6. Step 6: Final answer
   x = 5,283.14