Finding the Fourth Proportional to 1,145.17, 1,580.55 and 673.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.17 : 1,580.55 = 673.09 : x
2. Step 2: Convert to fraction form
   1,145.17/1,580.55 = 673.09/x
3. Step 3: Cross multiply
   1,145.17x = 1,580.55 × 673.09
4. Step 4: Simplify right side
   1,145.17x = 1,063,852.40
5. Step 5: Solve for x
   x = 1,063,852.40/1,145.17
6. Step 6: Final answer
   x = 928.99