Finding the Fourth Proportional to 1,216.55, 1,679.43 and 825.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.55 : 1,679.43 = 825.62 : x
2. Step 2: Convert to fraction form
   1,216.55/1,679.43 = 825.62/x
3. Step 3: Cross multiply
   1,216.55x = 1,679.43 × 825.62
4. Step 4: Simplify right side
   1,216.55x = 1,386,562.60
5. Step 5: Solve for x
   x = 1,386,562.60/1,216.55
6. Step 6: Final answer
   x = 1,139.75