Finding the Fourth Proportional to 2,179.78, 3,008.01 and 1,248.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,179.78 : 3,008.01 = 1,248.28 : x
2. Step 2: Convert to fraction form
   2,179.78/3,008.01 = 1,248.28/x
3. Step 3: Cross multiply
   2,179.78x = 3,008.01 × 1,248.28
4. Step 4: Simplify right side
   2,179.78x = 3,754,838.72
5. Step 5: Solve for x
   x = 3,754,838.72/2,179.78
6. Step 6: Final answer
   x = 1,722.58