Finding the Fourth Proportional to 1,123.59, 1,685.07 and 672.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.59 : 1,685.07 = 672.50 : x
2. Step 2: Convert to fraction form
   1,123.59/1,685.07 = 672.50/x
3. Step 3: Cross multiply
   1,123.59x = 1,685.07 × 672.50
4. Step 4: Simplify right side
   1,123.59x = 1,133,201.15
5. Step 5: Solve for x
   x = 1,133,201.15/1,123.59
6. Step 6: Final answer
   x = 1,008.55