Finding the Fourth Proportional to 1,985.59, 2,738.43 and 1,665.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.59 : 2,738.43 = 1,665.28 : x
2. Step 2: Convert to fraction form
   1,985.59/2,738.43 = 1,665.28/x
3. Step 3: Cross multiply
   1,985.59x = 2,738.43 × 1,665.28
4. Step 4: Simplify right side
   1,985.59x = 4,560,252.71
5. Step 5: Solve for x
   x = 4,560,252.71/1,985.59
6. Step 6: Final answer
   x = 2,296.67