Finding the Fourth Proportional to 1,871.15, 2,582.78 and 1,207.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,871.15 : 2,582.78 = 1,207.98 : x
2. Step 2: Convert to fraction form
   1,871.15/2,582.78 = 1,207.98/x
3. Step 3: Cross multiply
   1,871.15x = 2,582.78 × 1,207.98
4. Step 4: Simplify right side
   1,871.15x = 3,119,940.54
5. Step 5: Solve for x
   x = 3,119,940.54/1,871.15
6. Step 6: Final answer
   x = 1,667.40