Finding the Fourth Proportional to 1,868.86, 2,578.49 and 1,206.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,868.86 : 2,578.49 = 1,206.10 : x
2. Step 2: Convert to fraction form
   1,868.86/2,578.49 = 1,206.10/x
3. Step 3: Cross multiply
   1,868.86x = 2,578.49 × 1,206.10
4. Step 4: Simplify right side
   1,868.86x = 3,109,910.76
5. Step 5: Solve for x
   x = 3,109,910.76/1,868.86
6. Step 6: Final answer
   x = 1,664.07