Finding the Fourth Proportional to 1,008.72, 1,513.35 and 359.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.72 : 1,513.35 = 359.51 : x
2. Step 2: Convert to fraction form
   1,008.72/1,513.35 = 359.51/x
3. Step 3: Cross multiply
   1,008.72x = 1,513.35 × 359.51
4. Step 4: Simplify right side
   1,008.72x = 544,056.89
5. Step 5: Solve for x
   x = 544,056.89/1,008.72
6. Step 6: Final answer
   x = 539.35