Finding the Fourth Proportional to 2,390.55, 3,298.52 and 1,328.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.55 : 3,298.52 = 1,328.20 : x
2. Step 2: Convert to fraction form
   2,390.55/3,298.52 = 1,328.20/x
3. Step 3: Cross multiply
   2,390.55x = 3,298.52 × 1,328.20
4. Step 4: Simplify right side
   2,390.55x = 4,381,089.34
5. Step 5: Solve for x
   x = 4,381,089.34/2,390.55
6. Step 6: Final answer
   x = 1,832.67