Finding the Fourth Proportional to 2,315.49, 3,456.17 and 2,130.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,315.49 : 3,456.17 = 2,130.20 : x
2. Step 2: Convert to fraction form
   2,315.49/3,456.17 = 2,130.20/x
3. Step 3: Cross multiply
   2,315.49x = 3,456.17 × 2,130.20
4. Step 4: Simplify right side
   2,315.49x = 7,362,326.35
5. Step 5: Solve for x
   x = 7,362,326.35/2,315.49
6. Step 6: Final answer
   x = 3,179.60