Finding the Fourth Proportional to 4,103.10, 6,145.05 and 3,123.90

Step by Step Solution

1. Step 1: Write the proportion equation
   4,103.10 : 6,145.05 = 3,123.90 : x
2. Step 2: Convert to fraction form
   4,103.10/6,145.05 = 3,123.90/x
3. Step 3: Cross multiply
   4,103.10x = 6,145.05 × 3,123.90
4. Step 4: Simplify right side
   4,103.10x = 19,196,521.70
5. Step 5: Solve for x
   x = 19,196,521.70/4,103.10
6. Step 6: Final answer
   x = 4,678.54