Finding the Fourth Proportional to 2,142.63, 3,215.93 and 1,322.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.63 : 3,215.93 = 1,322.51 : x
2. Step 2: Convert to fraction form
   2,142.63/3,215.93 = 1,322.51/x
3. Step 3: Cross multiply
   2,142.63x = 3,215.93 × 1,322.51
4. Step 4: Simplify right side
   2,142.63x = 4,253,076.89
5. Step 5: Solve for x
   x = 4,253,076.89/2,142.63
6. Step 6: Final answer
   x = 1,984.98