Finding the Fourth Proportional to 2,142.16, 3,210.48 and 1,216.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.16 : 3,210.48 = 1,216.32 : x
2. Step 2: Convert to fraction form
   2,142.16/3,210.48 = 1,216.32/x
3. Step 3: Cross multiply
   2,142.16x = 3,210.48 × 1,216.32
4. Step 4: Simplify right side
   2,142.16x = 3,904,971.03
5. Step 5: Solve for x
   x = 3,904,971.03/2,142.16
6. Step 6: Final answer
   x = 1,822.91