Finding the Fourth Proportional to 2,142.16, 2,956.10 and 1,210.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.16 : 2,956.10 = 1,210.68 : x
2. Step 2: Convert to fraction form
   2,142.16/2,956.10 = 1,210.68/x
3. Step 3: Cross multiply
   2,142.16x = 2,956.10 × 1,210.68
4. Step 4: Simplify right side
   2,142.16x = 3,578,891.15
5. Step 5: Solve for x
   x = 3,578,891.15/2,142.16
6. Step 6: Final answer
   x = 1,670.69