Finding the Fourth Proportional to 1,123.56, 1,684.80 and 636.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.56 : 1,684.80 = 636.48 : x
2. Step 2: Convert to fraction form
   1,123.56/1,684.80 = 636.48/x
3. Step 3: Cross multiply
   1,123.56x = 1,684.80 × 636.48
4. Step 4: Simplify right side
   1,123.56x = 1,072,341.50
5. Step 5: Solve for x
   x = 1,072,341.50/1,123.56
6. Step 6: Final answer
   x = 954.41