Finding the Fourth Proportional to 5,890.62, 8,123.03 and 3,900.45

Step by Step Solution

1. Step 1: Write the proportion equation
   5,890.62 : 8,123.03 = 3,900.45 : x
2. Step 2: Convert to fraction form
   5,890.62/8,123.03 = 3,900.45/x
3. Step 3: Cross multiply
   5,890.62x = 8,123.03 × 3,900.45
4. Step 4: Simplify right side
   5,890.62x = 31,683,519.89
5. Step 5: Solve for x
   x = 31,683,519.89/5,890.62
6. Step 6: Final answer
   x = 5,378.64