Finding the Fourth Proportional to 1,018.72, 1,528.35 and 369.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.72 : 1,528.35 = 369.55 : x
2. Step 2: Convert to fraction form
   1,018.72/1,528.35 = 369.55/x
3. Step 3: Cross multiply
   1,018.72x = 1,528.35 × 369.55
4. Step 4: Simplify right side
   1,018.72x = 564,801.74
5. Step 5: Solve for x
   x = 564,801.74/1,018.72
6. Step 6: Final answer
   x = 554.42