Finding the Fourth Proportional to 6,123.90, 8,450.23 and 4,138.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,123.90 : 8,450.23 = 4,138.78 : x
2. Step 2: Convert to fraction form
   6,123.90/8,450.23 = 4,138.78/x
3. Step 3: Cross multiply
   6,123.90x = 8,450.23 × 4,138.78
4. Step 4: Simplify right side
   6,123.90x = 34,973,642.92
5. Step 5: Solve for x
   x = 34,973,642.92/6,123.90
6. Step 6: Final answer
   x = 5,711.01