Finding the Fourth Proportional to 1,105.08, 1,656.63 and 455.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.08 : 1,656.63 = 455.40 : x
2. Step 2: Convert to fraction form
   1,105.08/1,656.63 = 455.40/x
3. Step 3: Cross multiply
   1,105.08x = 1,656.63 × 455.40
4. Step 4: Simplify right side
   1,105.08x = 754,429.30
5. Step 5: Solve for x
   x = 754,429.30/1,105.08
6. Step 6: Final answer
   x = 682.69