Finding the Fourth Proportional to 1,304.87, 1,800.72 and 715.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,304.87 : 1,800.72 = 715.39 : x
2. Step 2: Convert to fraction form
   1,304.87/1,800.72 = 715.39/x
3. Step 3: Cross multiply
   1,304.87x = 1,800.72 × 715.39
4. Step 4: Simplify right side
   1,304.87x = 1,288,213.50
5. Step 5: Solve for x
   x = 1,288,213.50/1,304.87
6. Step 6: Final answer
   x = 987.24