Finding the Fourth Proportional to 1,109.27, 1,530.95 and 637.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.27 : 1,530.95 = 637.31 : x
2. Step 2: Convert to fraction form
   1,109.27/1,530.95 = 637.31/x
3. Step 3: Cross multiply
   1,109.27x = 1,530.95 × 637.31
4. Step 4: Simplify right side
   1,109.27x = 975,686.56
5. Step 5: Solve for x
   x = 975,686.56/1,109.27
6. Step 6: Final answer
   x = 879.58