Finding the Fourth Proportional to 1,160.51, 1,601.55 and 636.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,160.51 : 1,601.55 = 636.56 : x
2. Step 2: Convert to fraction form
   1,160.51/1,601.55 = 636.56/x
3. Step 3: Cross multiply
   1,160.51x = 1,601.55 × 636.56
4. Step 4: Simplify right side
   1,160.51x = 1,019,482.67
5. Step 5: Solve for x
   x = 1,019,482.67/1,160.51
6. Step 6: Final answer
   x = 878.48