Finding the Fourth Proportional to 1,549.47, 2,138.59 and 1,212.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,549.47 : 2,138.59 = 1,212.72 : x
2. Step 2: Convert to fraction form
   1,549.47/2,138.59 = 1,212.72/x
3. Step 3: Cross multiply
   1,549.47x = 2,138.59 × 1,212.72
4. Step 4: Simplify right side
   1,549.47x = 2,593,510.86
5. Step 5: Solve for x
   x = 2,593,510.86/1,549.47
6. Step 6: Final answer
   x = 1,673.81