Finding the Fourth Proportional to 1,139.34, 1,708.98 and 317.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.34 : 1,708.98 = 317.59 : x
2. Step 2: Convert to fraction form
   1,139.34/1,708.98 = 317.59/x
3. Step 3: Cross multiply
   1,139.34x = 1,708.98 × 317.59
4. Step 4: Simplify right side
   1,139.34x = 542,750.69
5. Step 5: Solve for x
   x = 542,750.69/1,139.34
6. Step 6: Final answer
   x = 476.37