Finding the Fourth Proportional to 1,378.67, 2,062.76 and 1,212.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.67 : 2,062.76 = 1,212.83 : x
2. Step 2: Convert to fraction form
   1,378.67/2,062.76 = 1,212.83/x
3. Step 3: Cross multiply
   1,378.67x = 2,062.76 × 1,212.83
4. Step 4: Simplify right side
   1,378.67x = 2,501,766.90
5. Step 5: Solve for x
   x = 2,501,766.90/1,378.67
6. Step 6: Final answer
   x = 1,814.62