Finding the Fourth Proportional to 1,317.48, 1,814.71 and 918.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,317.48 : 1,814.71 = 918.42 : x
2. Step 2: Convert to fraction form
   1,317.48/1,814.71 = 918.42/x
3. Step 3: Cross multiply
   1,317.48x = 1,814.71 × 918.42
4. Step 4: Simplify right side
   1,317.48x = 1,666,667.61
5. Step 5: Solve for x
   x = 1,666,667.61/1,317.48
6. Step 6: Final answer
   x = 1,265.05