Finding the Fourth Proportional to 1,362.20, 1,877.72 and 1,249.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,362.20 : 1,877.72 = 1,249.20 : x
2. Step 2: Convert to fraction form
   1,362.20/1,877.72 = 1,249.20/x
3. Step 3: Cross multiply
   1,362.20x = 1,877.72 × 1,249.20
4. Step 4: Simplify right side
   1,362.20x = 2,345,641.58
5. Step 5: Solve for x
   x = 2,345,641.58/1,362.20
6. Step 6: Final answer
   x = 1,721.96