Finding the Fourth Proportional to 1,243.42, 1,715.88 and 683.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243.42 : 1,715.88 = 683.86 : x
2. Step 2: Convert to fraction form
   1,243.42/1,715.88 = 683.86/x
3. Step 3: Cross multiply
   1,243.42x = 1,715.88 × 683.86
4. Step 4: Simplify right side
   1,243.42x = 1,173,421.70
5. Step 5: Solve for x
   x = 1,173,421.70/1,243.42
6. Step 6: Final answer
   x = 943.71