Finding the Fourth Proportional to 1,217.89, 1,679.98 and 825.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,217.89 : 1,679.98 = 825.01 : x
2. Step 2: Convert to fraction form
   1,217.89/1,679.98 = 825.01/x
3. Step 3: Cross multiply
   1,217.89x = 1,679.98 × 825.01
4. Step 4: Simplify right side
   1,217.89x = 1,386,000.30
5. Step 5: Solve for x
   x = 1,386,000.30/1,217.89
6. Step 6: Final answer
   x = 1,138.03