Finding the Fourth Proportional to 2,459.25, 3,689.06 and 815.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,459.25 : 3,689.06 = 815.76 : x
2. Step 2: Convert to fraction form
   2,459.25/3,689.06 = 815.76/x
3. Step 3: Cross multiply
   2,459.25x = 3,689.06 × 815.76
4. Step 4: Simplify right side
   2,459.25x = 3,009,383.51
5. Step 5: Solve for x
   x = 3,009,383.51/2,459.25
6. Step 6: Final answer
   x = 1,223.70