Finding the Fourth Proportional to 1,131.17, 1,561.04 and 633.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.17 : 1,561.04 = 633.86 : x
2. Step 2: Convert to fraction form
   1,131.17/1,561.04 = 633.86/x
3. Step 3: Cross multiply
   1,131.17x = 1,561.04 × 633.86
4. Step 4: Simplify right side
   1,131.17x = 989,469.84
5. Step 5: Solve for x
   x = 989,469.84/1,131.17
6. Step 6: Final answer
   x = 874.74