Finding the Fourth Proportional to 2,390.40, 3,298.50 and 1,328.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.40 : 3,298.50 = 1,328.16 : x
2. Step 2: Convert to fraction form
   2,390.40/3,298.50 = 1,328.16/x
3. Step 3: Cross multiply
   2,390.40x = 3,298.50 × 1,328.16
4. Step 4: Simplify right side
   2,390.40x = 4,380,935.76
5. Step 5: Solve for x
   x = 4,380,935.76/2,390.40
6. Step 6: Final answer
   x = 1,832.72