Finding the Fourth Proportional to 1,245.77, 1,719.25 and 825.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,245.77 : 1,719.25 = 825.41 : x
2. Step 2: Convert to fraction form
   1,245.77/1,719.25 = 825.41/x
3. Step 3: Cross multiply
   1,245.77x = 1,719.25 × 825.41
4. Step 4: Simplify right side
   1,245.77x = 1,419,075.48
5. Step 5: Solve for x
   x = 1,419,075.48/1,245.77
6. Step 6: Final answer
   x = 1,139.12