Finding the Fourth Proportional to 1,128.59, 1,693.22 and 684.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.59 : 1,693.22 = 684.35 : x
2. Step 2: Convert to fraction form
   1,128.59/1,693.22 = 684.35/x
3. Step 3: Cross multiply
   1,128.59x = 1,693.22 × 684.35
4. Step 4: Simplify right side
   1,128.59x = 1,158,749.57
5. Step 5: Solve for x
   x = 1,158,749.57/1,128.59
6. Step 6: Final answer
   x = 1,026.72