Finding the Fourth Proportional to 1,118.50, 1,677.71 and 388.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.50 : 1,677.71 = 388.01 : x
2. Step 2: Convert to fraction form
   1,118.50/1,677.71 = 388.01/x
3. Step 3: Cross multiply
   1,118.50x = 1,677.71 × 388.01
4. Step 4: Simplify right side
   1,118.50x = 650,973.42
5. Step 5: Solve for x
   x = 650,973.42/1,118.50
6. Step 6: Final answer
   x = 582.01