Finding the Fourth Proportional to 2,146.90, 2,962.71 and 1,215.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,146.90 : 2,962.71 = 1,215.40 : x
2. Step 2: Convert to fraction form
   2,146.90/2,962.71 = 1,215.40/x
3. Step 3: Cross multiply
   2,146.90x = 2,962.71 × 1,215.40
4. Step 4: Simplify right side
   2,146.90x = 3,600,877.73
5. Step 5: Solve for x
   x = 3,600,877.73/2,146.90
6. Step 6: Final answer
   x = 1,677.25