Finding the Fourth Proportional to 2,078.30, 3,113.67 and 1,209.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.30 : 3,113.67 = 1,209.98 : x
2. Step 2: Convert to fraction form
   2,078.30/3,113.67 = 1,209.98/x
3. Step 3: Cross multiply
   2,078.30x = 3,113.67 × 1,209.98
4. Step 4: Simplify right side
   2,078.30x = 3,767,478.43
5. Step 5: Solve for x
   x = 3,767,478.43/2,078.30
6. Step 6: Final answer
   x = 1,812.77