Finding the Fourth Proportional to 1,304.91, 1,800.80 and 715.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,304.91 : 1,800.80 = 715.43 : x
2. Step 2: Convert to fraction form
   1,304.91/1,800.80 = 715.43/x
3. Step 3: Cross multiply
   1,304.91x = 1,800.80 × 715.43
4. Step 4: Simplify right side
   1,304.91x = 1,288,333.76
5. Step 5: Solve for x
   x = 1,288,333.76/1,304.91
6. Step 6: Final answer
   x = 987.30