Finding the Fourth Proportional to 1,109.18, 1,530.46 and 637.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.18 : 1,530.46 = 637.24 : x
2. Step 2: Convert to fraction form
   1,109.18/1,530.46 = 637.24/x
3. Step 3: Cross multiply
   1,109.18x = 1,530.46 × 637.24
4. Step 4: Simplify right side
   1,109.18x = 975,270.33
5. Step 5: Solve for x
   x = 975,270.33/1,109.18
6. Step 6: Final answer
   x = 879.27