Finding the Fourth Proportional to 1,415.45, 2,124.43 and 685.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,415.45 : 2,124.43 = 685.58 : x
2. Step 2: Convert to fraction form
   1,415.45/2,124.43 = 685.58/x
3. Step 3: Cross multiply
   1,415.45x = 2,124.43 × 685.58
4. Step 4: Simplify right side
   1,415.45x = 1,456,454.38
5. Step 5: Solve for x
   x = 1,456,454.38/1,415.45
6. Step 6: Final answer
   x = 1,028.97