Finding the Fourth Proportional to 1,145.60, 1,580.39 and 673.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.60 : 1,580.39 = 673.34 : x
2. Step 2: Convert to fraction form
   1,145.60/1,580.39 = 673.34/x
3. Step 3: Cross multiply
   1,145.60x = 1,580.39 × 673.34
4. Step 4: Simplify right side
   1,145.60x = 1,064,139.80
5. Step 5: Solve for x
   x = 1,064,139.80/1,145.60
6. Step 6: Final answer
   x = 928.90