Finding the Fourth Proportional to 1,123.50, 1,681.73 and 711.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.50 : 1,681.73 = 711.21 : x
2. Step 2: Convert to fraction form
   1,123.50/1,681.73 = 711.21/x
3. Step 3: Cross multiply
   1,123.50x = 1,681.73 × 711.21
4. Step 4: Simplify right side
   1,123.50x = 1,196,063.19
5. Step 5: Solve for x
   x = 1,196,063.19/1,123.50
6. Step 6: Final answer
   x = 1,064.59