Finding the Fourth Proportional to 1,008.18, 1,391.36 and 588.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.18 : 1,391.36 = 588.69 : x
2. Step 2: Convert to fraction form
   1,008.18/1,391.36 = 588.69/x
3. Step 3: Cross multiply
   1,008.18x = 1,391.36 × 588.69
4. Step 4: Simplify right side
   1,008.18x = 819,076.77
5. Step 5: Solve for x
   x = 819,076.77/1,008.18
6. Step 6: Final answer
   x = 812.43