Finding the Fourth Proportional to 2,146.78, 2,962.74 and 1,215.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,146.78 : 2,962.74 = 1,215.28 : x
2. Step 2: Convert to fraction form
   2,146.78/2,962.74 = 1,215.28/x
3. Step 3: Cross multiply
   2,146.78x = 2,962.74 × 1,215.28
4. Step 4: Simplify right side
   2,146.78x = 3,600,558.67
5. Step 5: Solve for x
   x = 3,600,558.67/2,146.78
6. Step 6: Final answer
   x = 1,677.19