Finding the Fourth Proportional to 2,210.12, 3,049.78 and 1,215.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,210.12 : 3,049.78 = 1,215.40 : x
2. Step 2: Convert to fraction form
   2,210.12/3,049.78 = 1,215.40/x
3. Step 3: Cross multiply
   2,210.12x = 3,049.78 × 1,215.40
4. Step 4: Simplify right side
   2,210.12x = 3,706,702.61
5. Step 5: Solve for x
   x = 3,706,702.61/2,210.12
6. Step 6: Final answer
   x = 1,677.15