Finding the Fourth Proportional to 3,404.10, 5,131.29 and 3,123.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,404.10 : 5,131.29 = 3,123.30 : x
2. Step 2: Convert to fraction form
   3,404.10/5,131.29 = 3,123.30/x
3. Step 3: Cross multiply
   3,404.10x = 5,131.29 × 3,123.30
4. Step 4: Simplify right side
   3,404.10x = 16,026,558.06
5. Step 5: Solve for x
   x = 16,026,558.06/3,404.10
6. Step 6: Final answer
   x = 4,708.02