Finding the Fourth Proportional to 1,131.35, 1,561.08 and 633.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.35 : 1,561.08 = 633.98 : x
2. Step 2: Convert to fraction form
   1,131.35/1,561.08 = 633.98/x
3. Step 3: Cross multiply
   1,131.35x = 1,561.08 × 633.98
4. Step 4: Simplify right side
   1,131.35x = 989,693.50
5. Step 5: Solve for x
   x = 989,693.50/1,131.35
6. Step 6: Final answer
   x = 874.79