Finding the Fourth Proportional to 1,729.72, 2,386.71 and 1,642.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,729.72 : 2,386.71 = 1,642.15 : x
2. Step 2: Convert to fraction form
   1,729.72/2,386.71 = 1,642.15/x
3. Step 3: Cross multiply
   1,729.72x = 2,386.71 × 1,642.15
4. Step 4: Simplify right side
   1,729.72x = 3,919,323.89
5. Step 5: Solve for x
   x = 3,919,323.89/1,729.72
6. Step 6: Final answer
   x = 2,265.88