Finding the Fourth Proportional to 1,362.72, 2,043.76 and 388.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,362.72 : 2,043.76 = 388.96 : x
2. Step 2: Convert to fraction form
   1,362.72/2,043.76 = 388.96/x
3. Step 3: Cross multiply
   1,362.72x = 2,043.76 × 388.96
4. Step 4: Simplify right side
   1,362.72x = 794,940.89
5. Step 5: Solve for x
   x = 794,940.89/1,362.72
6. Step 6: Final answer
   x = 583.35