Finding the Fourth Proportional to 1,139.34, 1,572.30 and 673.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.34 : 1,572.30 = 673.50 : x
2. Step 2: Convert to fraction form
   1,139.34/1,572.30 = 673.50/x
3. Step 3: Cross multiply
   1,139.34x = 1,572.30 × 673.50
4. Step 4: Simplify right side
   1,139.34x = 1,058,944.05
5. Step 5: Solve for x
   x = 1,058,944.05/1,139.34
6. Step 6: Final answer
   x = 929.44