Finding the Fourth Proportional to 1,242.72, 1,715.01 and 683.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.72 : 1,715.01 = 683.21 : x
2. Step 2: Convert to fraction form
   1,242.72/1,715.01 = 683.21/x
3. Step 3: Cross multiply
   1,242.72x = 1,715.01 × 683.21
4. Step 4: Simplify right side
   1,242.72x = 1,171,711.98
5. Step 5: Solve for x
   x = 1,171,711.98/1,242.72
6. Step 6: Final answer
   x = 942.86