Finding the Fourth Proportional to 1,101.94, 1,520.73 and 636.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,101.94 : 1,520.73 = 636.34 : x
2. Step 2: Convert to fraction form
   1,101.94/1,520.73 = 636.34/x
3. Step 3: Cross multiply
   1,101.94x = 1,520.73 × 636.34
4. Step 4: Simplify right side
   1,101.94x = 967,701.33
5. Step 5: Solve for x
   x = 967,701.33/1,101.94
6. Step 6: Final answer
   x = 878.18