Finding the Fourth Proportional to 1,356.66, 1,871.46 and 859.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.66 : 1,871.46 = 859.12 : x
2. Step 2: Convert to fraction form
   1,356.66/1,871.46 = 859.12/x
3. Step 3: Cross multiply
   1,356.66x = 1,871.46 × 859.12
4. Step 4: Simplify right side
   1,356.66x = 1,607,804.04
5. Step 5: Solve for x
   x = 1,607,804.04/1,356.66
6. Step 6: Final answer
   x = 1,185.12