Finding the Fourth Proportional to 2,147.82, 3,221.52 and 686.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.82 : 3,221.52 = 686.94 : x
2. Step 2: Convert to fraction form
   2,147.82/3,221.52 = 686.94/x
3. Step 3: Cross multiply
   2,147.82x = 3,221.52 × 686.94
4. Step 4: Simplify right side
   2,147.82x = 2,212,990.95
5. Step 5: Solve for x
   x = 2,212,990.95/2,147.82
6. Step 6: Final answer
   x = 1,030.34