Finding the Fourth Proportional to 1,145.76, 1,581.05 and 673.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.76 : 1,581.05 = 673.67 : x
2. Step 2: Convert to fraction form
   1,145.76/1,581.05 = 673.67/x
3. Step 3: Cross multiply
   1,145.76x = 1,581.05 × 673.67
4. Step 4: Simplify right side
   1,145.76x = 1,065,111.59
5. Step 5: Solve for x
   x = 1,065,111.59/1,145.76
6. Step 6: Final answer
   x = 929.61