Finding the Fourth Proportional to 1,160.42, 1,601.40 and 636.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.42 : 1,601.40 = 636.45 : x
2. Step 2: Convert to fraction form
   1,160.42/1,601.40 = 636.45/x
3. Step 3: Cross multiply
   1,160.42x = 1,601.40 × 636.45
4. Step 4: Simplify right side
   1,160.42x = 1,019,211.03
5. Step 5: Solve for x
   x = 1,019,211.03/1,160.42
6. Step 6: Final answer
   x = 878.31