Finding the Fourth Proportional to 1,320.41, 1,980.61 and 454.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.41 : 1,980.61 = 454.72 : x
2. Step 2: Convert to fraction form
   1,320.41/1,980.61 = 454.72/x
3. Step 3: Cross multiply
   1,320.41x = 1,980.61 × 454.72
4. Step 4: Simplify right side
   1,320.41x = 900,622.98
5. Step 5: Solve for x
   x = 900,622.98/1,320.41
6. Step 6: Final answer
   x = 682.08