Finding the Fourth Proportional to 1,304.86, 1,800.71 and 715.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,304.86 : 1,800.71 = 715.40 : x
2. Step 2: Convert to fraction form
   1,304.86/1,800.71 = 715.40/x
3. Step 3: Cross multiply
   1,304.86x = 1,800.71 × 715.40
4. Step 4: Simplify right side
   1,304.86x = 1,288,228.81
5. Step 5: Solve for x
   x = 1,288,228.81/1,304.86
6. Step 6: Final answer
   x = 987.25