Finding the Fourth Proportional to 1,055.72, 1,457.00 and 636.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.72 : 1,457.00 = 636.27 : x
2. Step 2: Convert to fraction form
   1,055.72/1,457.00 = 636.27/x
3. Step 3: Cross multiply
   1,055.72x = 1,457.00 × 636.27
4. Step 4: Simplify right side
   1,055.72x = 927,042.21
5. Step 5: Solve for x
   x = 927,042.21/1,055.72
6. Step 6: Final answer
   x = 878.12