Finding the Fourth Proportional to 1,767.21, 2,637.89 and 1,638.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,767.21 : 2,637.89 = 1,638.71 : x
2. Step 2: Convert to fraction form
   1,767.21/2,637.89 = 1,638.71/x
3. Step 3: Cross multiply
   1,767.21x = 2,637.89 × 1,638.71
4. Step 4: Simplify right side
   1,767.21x = 4,322,736.72
5. Step 5: Solve for x
   x = 4,322,736.72/1,767.21
6. Step 6: Final answer
   x = 2,446.08