Finding the Fourth Proportional to 2,179.80, 3,006.72 and 1,248.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,179.80 : 3,006.72 = 1,248.30 : x
2. Step 2: Convert to fraction form
   2,179.80/3,006.72 = 1,248.30/x
3. Step 3: Cross multiply
   2,179.80x = 3,006.72 × 1,248.30
4. Step 4: Simplify right side
   2,179.80x = 3,753,288.58
5. Step 5: Solve for x
   x = 3,753,288.58/2,179.80
6. Step 6: Final answer
   x = 1,721.85