Finding the Fourth Proportional to 1,665.25, 2,493.61 and 1,615.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.25 : 2,493.61 = 1,615.98 : x
2. Step 2: Convert to fraction form
   1,665.25/2,493.61 = 1,615.98/x
3. Step 3: Cross multiply
   1,665.25x = 2,493.61 × 1,615.98
4. Step 4: Simplify right side
   1,665.25x = 4,029,623.89
5. Step 5: Solve for x
   x = 4,029,623.89/1,665.25
6. Step 6: Final answer
   x = 2,419.83