Finding the Fourth Proportional to 1,207.89, 1,666.71 and 683.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,207.89 : 1,666.71 = 683.91 : x
2. Step 2: Convert to fraction form
   1,207.89/1,666.71 = 683.91/x
3. Step 3: Cross multiply
   1,207.89x = 1,666.71 × 683.91
4. Step 4: Simplify right side
   1,207.89x = 1,139,879.64
5. Step 5: Solve for x
   x = 1,139,879.64/1,207.89
6. Step 6: Final answer
   x = 943.69