Finding the Fourth Proportional to 5,423.91, 8,139.10 and 3,777.18

Step by Step Solution

1. Step 1: Write the proportion equation
   5,423.91 : 8,139.10 = 3,777.18 : x
2. Step 2: Convert to fraction form
   5,423.91/8,139.10 = 3,777.18/x
3. Step 3: Cross multiply
   5,423.91x = 8,139.10 × 3,777.18
4. Step 4: Simplify right side
   5,423.91x = 30,742,845.74
5. Step 5: Solve for x
   x = 30,742,845.74/5,423.91
6. Step 6: Final answer
   x = 5,668.02