Finding the Fourth Proportional to 1,128.42, 1,690.32 and 836.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,128.42 : 1,690.32 = 836.82 : x
2. Step 2: Convert to fraction form
   1,128.42/1,690.32 = 836.82/x
3. Step 3: Cross multiply
   1,128.42x = 1,690.32 × 836.82
4. Step 4: Simplify right side
   1,128.42x = 1,414,493.58
5. Step 5: Solve for x
   x = 1,414,493.58/1,128.42
6. Step 6: Final answer
   x = 1,253.52