Finding the Fourth Proportional to 1,053.16, 1,579.72 and 322.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.16 : 1,579.72 = 322.72 : x
2. Step 2: Convert to fraction form
   1,053.16/1,579.72 = 322.72/x
3. Step 3: Cross multiply
   1,053.16x = 1,579.72 × 322.72
4. Step 4: Simplify right side
   1,053.16x = 509,799.34
5. Step 5: Solve for x
   x = 509,799.34/1,053.16
6. Step 6: Final answer
   x = 484.07