Finding the Fourth Proportional to 3,484.10, 5,238.30 and 3,411.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,484.10 : 5,238.30 = 3,411.20 : x
2. Step 2: Convert to fraction form
   3,484.10/5,238.30 = 3,411.20/x
3. Step 3: Cross multiply
   3,484.10x = 5,238.30 × 3,411.20
4. Step 4: Simplify right side
   3,484.10x = 17,868,888.96
5. Step 5: Solve for x
   x = 17,868,888.96/3,484.10
6. Step 6: Final answer
   x = 5,128.70