Finding the Fourth Proportional to 1,491.63, 2,057.71 and 1,212.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,491.63 : 2,057.71 = 1,212.18 : x
2. Step 2: Convert to fraction form
   1,491.63/2,057.71 = 1,212.18/x
3. Step 3: Cross multiply
   1,491.63x = 2,057.71 × 1,212.18
4. Step 4: Simplify right side
   1,491.63x = 2,494,314.91
5. Step 5: Solve for x
   x = 2,494,314.91/1,491.63
6. Step 6: Final answer
   x = 1,672.21