Finding the Fourth Proportional to 1,109.82, 1,531.46 and 637.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.82 : 1,531.46 = 637.69 : x
2. Step 2: Convert to fraction form
   1,109.82/1,531.46 = 637.69/x
3. Step 3: Cross multiply
   1,109.82x = 1,531.46 × 637.69
4. Step 4: Simplify right side
   1,109.82x = 976,600.24
5. Step 5: Solve for x
   x = 976,600.24/1,109.82
6. Step 6: Final answer
   x = 879.96