Finding the Fourth Proportional to 1,116.39, 1,673.96 and 458.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.39 : 1,673.96 = 458.09 : x
2. Step 2: Convert to fraction form
   1,116.39/1,673.96 = 458.09/x
3. Step 3: Cross multiply
   1,116.39x = 1,673.96 × 458.09
4. Step 4: Simplify right side
   1,116.39x = 766,824.34
5. Step 5: Solve for x
   x = 766,824.34/1,116.39
6. Step 6: Final answer
   x = 686.88