Finding the Fourth Proportional to 1,322.10, 1,981.89 and 774.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,322.10 : 1,981.89 = 774.18 : x
2. Step 2: Convert to fraction form
   1,322.10/1,981.89 = 774.18/x
3. Step 3: Cross multiply
   1,322.10x = 1,981.89 × 774.18
4. Step 4: Simplify right side
   1,322.10x = 1,534,339.60
5. Step 5: Solve for x
   x = 1,534,339.60/1,322.10
6. Step 6: Final answer
   x = 1,160.53