Finding the Fourth Proportional to 1,317.31, 1,976.10 and 451.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,317.31 : 1,976.10 = 451.42 : x
2. Step 2: Convert to fraction form
   1,317.31/1,976.10 = 451.42/x
3. Step 3: Cross multiply
   1,317.31x = 1,976.10 × 451.42
4. Step 4: Simplify right side
   1,317.31x = 892,051.06
5. Step 5: Solve for x
   x = 892,051.06/1,317.31
6. Step 6: Final answer
   x = 677.18