Finding the Fourth Proportional to 1,145.39, 1,580.54 and 673.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.39 : 1,580.54 = 673.30 : x
2. Step 2: Convert to fraction form
   1,145.39/1,580.54 = 673.30/x
3. Step 3: Cross multiply
   1,145.39x = 1,580.54 × 673.30
4. Step 4: Simplify right side
   1,145.39x = 1,064,167.30
5. Step 5: Solve for x
   x = 1,064,167.30/1,145.39
6. Step 6: Final answer
   x = 929.09