Finding the Fourth Proportional to 1,081.09, 1,622.18 and 772.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.09 : 1,622.18 = 772.55 : x
2. Step 2: Convert to fraction form
   1,081.09/1,622.18 = 772.55/x
3. Step 3: Cross multiply
   1,081.09x = 1,622.18 × 772.55
4. Step 4: Simplify right side
   1,081.09x = 1,253,215.16
5. Step 5: Solve for x
   x = 1,253,215.16/1,081.09
6. Step 6: Final answer
   x = 1,159.21