Finding the Fourth Proportional to 1,081.58, 1,622.50 and 388.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.58 : 1,622.50 = 388.10 : x
2. Step 2: Convert to fraction form
   1,081.58/1,622.50 = 388.10/x
3. Step 3: Cross multiply
   1,081.58x = 1,622.50 × 388.10
4. Step 4: Simplify right side
   1,081.58x = 629,692.25
5. Step 5: Solve for x
   x = 629,692.25/1,081.58
6. Step 6: Final answer
   x = 582.20