Finding the Fourth Proportional to 1,084.86, 1,626.91 and 391.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.86 : 1,626.91 = 391.34 : x
2. Step 2: Convert to fraction form
   1,084.86/1,626.91 = 391.34/x
3. Step 3: Cross multiply
   1,084.86x = 1,626.91 × 391.34
4. Step 4: Simplify right side
   1,084.86x = 636,674.96
5. Step 5: Solve for x
   x = 636,674.96/1,084.86
6. Step 6: Final answer
   x = 586.87