Finding the Fourth Proportional to 1,077.94, 1,487.59 and 636.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.94 : 1,487.59 = 636.22 : x
2. Step 2: Convert to fraction form
   1,077.94/1,487.59 = 636.22/x
3. Step 3: Cross multiply
   1,077.94x = 1,487.59 × 636.22
4. Step 4: Simplify right side
   1,077.94x = 946,429.20
5. Step 5: Solve for x
   x = 946,429.20/1,077.94
6. Step 6: Final answer
   x = 878.00