Finding the Fourth Proportional to 1,008.96, 1,513.72 and 359.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.96 : 1,513.72 = 359.76 : x
2. Step 2: Convert to fraction form
   1,008.96/1,513.72 = 359.76/x
3. Step 3: Cross multiply
   1,008.96x = 1,513.72 × 359.76
4. Step 4: Simplify right side
   1,008.96x = 544,575.91
5. Step 5: Solve for x
   x = 544,575.91/1,008.96
6. Step 6: Final answer
   x = 539.74