Finding the Fourth Proportional to 1,320.04, 1,980.42 and 454.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.04 : 1,980.42 = 454.42 : x
2. Step 2: Convert to fraction form
   1,320.04/1,980.42 = 454.42/x
3. Step 3: Cross multiply
   1,320.04x = 1,980.42 × 454.42
4. Step 4: Simplify right side
   1,320.04x = 899,942.46
5. Step 5: Solve for x
   x = 899,942.46/1,320.04
6. Step 6: Final answer
   x = 681.75