Finding the Fourth Proportional to 1,131.39, 1,561.23 and 633.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.39 : 1,561.23 = 633.96 : x
2. Step 2: Convert to fraction form
   1,131.39/1,561.23 = 633.96/x
3. Step 3: Cross multiply
   1,131.39x = 1,561.23 × 633.96
4. Step 4: Simplify right side
   1,131.39x = 989,757.37
5. Step 5: Solve for x
   x = 989,757.37/1,131.39
6. Step 6: Final answer
   x = 874.82