Finding the Fourth Proportional to 1,018.32, 1,404.69 and 686.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.32 : 1,404.69 = 686.17 : x
2. Step 2: Convert to fraction form
   1,018.32/1,404.69 = 686.17/x
3. Step 3: Cross multiply
   1,018.32x = 1,404.69 × 686.17
4. Step 4: Simplify right side
   1,018.32x = 963,859.18
5. Step 5: Solve for x
   x = 963,859.18/1,018.32
6. Step 6: Final answer
   x = 946.52