Finding the Fourth Proportional to 1,661.22, 2,492.10 and 1,296.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.22 : 2,492.10 = 1,296.72 : x
2. Step 2: Convert to fraction form
   1,661.22/2,492.10 = 1,296.72/x
3. Step 3: Cross multiply
   1,661.22x = 2,492.10 × 1,296.72
4. Step 4: Simplify right side
   1,661.22x = 3,231,555.91
5. Step 5: Solve for x
   x = 3,231,555.91/1,661.22
6. Step 6: Final answer
   x = 1,945.29