Finding the Fourth Proportional to 736.42, 1,105.30 and 389.98

Step by Step Solution

1. Step 1: Write the proportion equation
   736.42 : 1,105.30 = 389.98 : x
2. Step 2: Convert to fraction form
   736.42/1,105.30 = 389.98/x
3. Step 3: Cross multiply
   736.42x = 1,105.30 × 389.98
4. Step 4: Simplify right side
   736.42x = 431,044.89
5. Step 5: Solve for x
   x = 431,044.89/736.42
6. Step 6: Final answer
   x = 585.32