Finding the Fourth Proportional to 2,671.92, 4,006.56 and 1,209

Step by Step Solution

1. Step 1: Write the proportion equation
   2,671.92 : 4,006.56 = 1,209 : x
2. Step 2: Convert to fraction form
   2,671.92/4,006.56 = 1,209/x
3. Step 3: Cross multiply
   2,671.92x = 4,006.56 × 1,209
4. Step 4: Simplify right side
   2,671.92x = 4,843,931.04
5. Step 5: Solve for x
   x = 4,843,931.04/2,671.92
6. Step 6: Final answer
   x = 1,812.90