Finding the Fourth Proportional to 3,818.55, 5,269.82 and 2,139.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,818.55 : 5,269.82 = 2,139.86 : x
2. Step 2: Convert to fraction form
   3,818.55/5,269.82 = 2,139.86/x
3. Step 3: Cross multiply
   3,818.55x = 5,269.82 × 2,139.86
4. Step 4: Simplify right side
   3,818.55x = 11,276,679.50
5. Step 5: Solve for x
   x = 11,276,679.50/3,818.55
6. Step 6: Final answer
   x = 2,953.13