Finding the Fourth Proportional to 1,139.06, 1,708.18 and 774.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.06 : 1,708.18 = 774.16 : x
2. Step 2: Convert to fraction form
   1,139.06/1,708.18 = 774.16/x
3. Step 3: Cross multiply
   1,139.06x = 1,708.18 × 774.16
4. Step 4: Simplify right side
   1,139.06x = 1,322,404.63
5. Step 5: Solve for x
   x = 1,322,404.63/1,139.06
6. Step 6: Final answer
   x = 1,160.96