Finding the Fourth Proportional to 1,726.47, 2,577.40 and 1,665.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,726.47 : 2,577.40 = 1,665.72 : x
2. Step 2: Convert to fraction form
   1,726.47/2,577.40 = 1,665.72/x
3. Step 3: Cross multiply
   1,726.47x = 2,577.40 × 1,665.72
4. Step 4: Simplify right side
   1,726.47x = 4,293,222.56
5. Step 5: Solve for x
   x = 4,293,222.56/1,726.47
6. Step 6: Final answer
   x = 2,486.71