Finding the Fourth Proportional to 1,017.63, 1,517.82 and 986.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.63 : 1,517.82 = 986.87 : x
2. Step 2: Convert to fraction form
   1,017.63/1,517.82 = 986.87/x
3. Step 3: Cross multiply
   1,017.63x = 1,517.82 × 986.87
4. Step 4: Simplify right side
   1,017.63x = 1,497,894.82
5. Step 5: Solve for x
   x = 1,497,894.82/1,017.63
6. Step 6: Final answer
   x = 1,471.94