Finding the Fourth Proportional to 1,131.33, 1,561.21 and 633.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.33 : 1,561.21 = 633.96 : x
2. Step 2: Convert to fraction form
   1,131.33/1,561.21 = 633.96/x
3. Step 3: Cross multiply
   1,131.33x = 1,561.21 × 633.96
4. Step 4: Simplify right side
   1,131.33x = 989,744.69
5. Step 5: Solve for x
   x = 989,744.69/1,131.33
6. Step 6: Final answer
   x = 874.85