Finding the Fourth Proportional to 1,053.34, 1,578.38 and 403.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.34 : 1,578.38 = 403.72 : x
2. Step 2: Convert to fraction form
   1,053.34/1,578.38 = 403.72/x
3. Step 3: Cross multiply
   1,053.34x = 1,578.38 × 403.72
4. Step 4: Simplify right side
   1,053.34x = 637,223.57
5. Step 5: Solve for x
   x = 637,223.57/1,053.34
6. Step 6: Final answer
   x = 604.96