Finding the Fourth Proportional to 1,030.22, 1,421.72 and 637.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.22 : 1,421.72 = 637.27 : x
2. Step 2: Convert to fraction form
   1,030.22/1,421.72 = 637.27/x
3. Step 3: Cross multiply
   1,030.22x = 1,421.72 × 637.27
4. Step 4: Simplify right side
   1,030.22x = 906,015.15
5. Step 5: Solve for x
   x = 906,015.15/1,030.22
6. Step 6: Final answer
   x = 879.44