Finding the Fourth Proportional to 1,123.58, 1,685.54 and 636.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.58 : 1,685.54 = 636.86 : x
2. Step 2: Convert to fraction form
   1,123.58/1,685.54 = 636.86/x
3. Step 3: Cross multiply
   1,123.58x = 1,685.54 × 636.86
4. Step 4: Simplify right side
   1,123.58x = 1,073,446.17
5. Step 5: Solve for x
   x = 1,073,446.17/1,123.58
6. Step 6: Final answer
   x = 955.38