Finding the Fourth Proportional to 1,139.94, 1,572.12 and 767.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.94 : 1,572.12 = 767.34 : x
2. Step 2: Convert to fraction form
   1,139.94/1,572.12 = 767.34/x
3. Step 3: Cross multiply
   1,139.94x = 1,572.12 × 767.34
4. Step 4: Simplify right side
   1,139.94x = 1,206,350.56
5. Step 5: Solve for x
   x = 1,206,350.56/1,139.94
6. Step 6: Final answer
   x = 1,058.26