Finding the Fourth Proportional to 1,028.86, 1,419.73 and 636.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,028.86 : 1,419.73 = 636.01 : x
2. Step 2: Convert to fraction form
   1,028.86/1,419.73 = 636.01/x
3. Step 3: Cross multiply
   1,028.86x = 1,419.73 × 636.01
4. Step 4: Simplify right side
   1,028.86x = 902,962.48
5. Step 5: Solve for x
   x = 902,962.48/1,028.86
6. Step 6: Final answer
   x = 877.63