Finding the Fourth Proportional to 1,304.68, 1,800.50 and 715.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,304.68 : 1,800.50 = 715.21 : x
2. Step 2: Convert to fraction form
   1,304.68/1,800.50 = 715.21/x
3. Step 3: Cross multiply
   1,304.68x = 1,800.50 × 715.21
4. Step 4: Simplify right side
   1,304.68x = 1,287,732.89
5. Step 5: Solve for x
   x = 1,287,732.89/1,304.68
6. Step 6: Final answer
   x = 987.01