Finding the Fourth Proportional to 1,131.69, 1,561.79 and 634.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.69 : 1,561.79 = 634.38 : x
2. Step 2: Convert to fraction form
   1,131.69/1,561.79 = 634.38/x
3. Step 3: Cross multiply
   1,131.69x = 1,561.79 × 634.38
4. Step 4: Simplify right side
   1,131.69x = 990,768.34
5. Step 5: Solve for x
   x = 990,768.34/1,131.69
6. Step 6: Final answer
   x = 875.48