Finding the Fourth Proportional to 1,212.76, 1,662.69 and 1,190.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212.76 : 1,662.69 = 1,190.88 : x
2. Step 2: Convert to fraction form
   1,212.76/1,662.69 = 1,190.88/x
3. Step 3: Cross multiply
   1,212.76x = 1,662.69 × 1,190.88
4. Step 4: Simplify right side
   1,212.76x = 1,980,064.27
5. Step 5: Solve for x
   x = 1,980,064.27/1,212.76
6. Step 6: Final answer
   x = 1,632.69