Finding the Fourth Proportional to 1,212.38, 1,662.18 and 1,190.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212.38 : 1,662.18 = 1,190.51 : x
2. Step 2: Convert to fraction form
   1,212.38/1,662.18 = 1,190.51/x
3. Step 3: Cross multiply
   1,212.38x = 1,662.18 × 1,190.51
4. Step 4: Simplify right side
   1,212.38x = 1,978,841.91
5. Step 5: Solve for x
   x = 1,978,841.91/1,212.38
6. Step 6: Final answer
   x = 1,632.20