Finding the Fourth Proportional to 1,304.55, 1,800.18 and 715.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,304.55 : 1,800.18 = 715.05 : x
2. Step 2: Convert to fraction form
   1,304.55/1,800.18 = 715.05/x
3. Step 3: Cross multiply
   1,304.55x = 1,800.18 × 715.05
4. Step 4: Simplify right side
   1,304.55x = 1,287,218.71
5. Step 5: Solve for x
   x = 1,287,218.71/1,304.55
6. Step 6: Final answer
   x = 986.71