Finding the Fourth Proportional to 1,118.34, 1,677.69 and 388.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.34 : 1,677.69 = 388.35 : x
2. Step 2: Convert to fraction form
   1,118.34/1,677.69 = 388.35/x
3. Step 3: Cross multiply
   1,118.34x = 1,677.69 × 388.35
4. Step 4: Simplify right side
   1,118.34x = 651,530.91
5. Step 5: Solve for x
   x = 651,530.91/1,118.34
6. Step 6: Final answer
   x = 582.59