Finding the Fourth Proportional to 1,056.33, 1,458.03 and 636.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.33 : 1,458.03 = 636.72 : x
2. Step 2: Convert to fraction form
   1,056.33/1,458.03 = 636.72/x
3. Step 3: Cross multiply
   1,056.33x = 1,458.03 × 636.72
4. Step 4: Simplify right side
   1,056.33x = 928,356.86
5. Step 5: Solve for x
   x = 928,356.86/1,056.33
6. Step 6: Final answer
   x = 878.85