Finding the Fourth Proportional to 1,085.48, 1,497.88 and 637.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.48 : 1,497.88 = 637.31 : x
2. Step 2: Convert to fraction form
   1,085.48/1,497.88 = 637.31/x
3. Step 3: Cross multiply
   1,085.48x = 1,497.88 × 637.31
4. Step 4: Simplify right side
   1,085.48x = 954,603.23
5. Step 5: Solve for x
   x = 954,603.23/1,085.48
6. Step 6: Final answer
   x = 879.43