Finding the Fourth Proportional to 1,139.35, 1,572.54 and 673.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.35 : 1,572.54 = 673.67 : x
2. Step 2: Convert to fraction form
   1,139.35/1,572.54 = 673.67/x
3. Step 3: Cross multiply
   1,139.35x = 1,572.54 × 673.67
4. Step 4: Simplify right side
   1,139.35x = 1,059,373.02
5. Step 5: Solve for x
   x = 1,059,373.02/1,139.35
6. Step 6: Final answer
   x = 929.80