Finding the Fourth Proportional to 1,076.64, 1,613.31 and 491.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.64 : 1,613.31 = 491.31 : x
2. Step 2: Convert to fraction form
   1,076.64/1,613.31 = 491.31/x
3. Step 3: Cross multiply
   1,076.64x = 1,613.31 × 491.31
4. Step 4: Simplify right side
   1,076.64x = 792,635.34
5. Step 5: Solve for x
   x = 792,635.34/1,076.64
6. Step 6: Final answer
   x = 736.21