Finding the Fourth Proportional to 1,131.34, 1,561.24 and 633.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.34 : 1,561.24 = 633.98 : x
2. Step 2: Convert to fraction form
   1,131.34/1,561.24 = 633.98/x
3. Step 3: Cross multiply
   1,131.34x = 1,561.24 × 633.98
4. Step 4: Simplify right side
   1,131.34x = 989,794.94
5. Step 5: Solve for x
   x = 989,794.94/1,131.34
6. Step 6: Final answer
   x = 874.89