Finding the Fourth Proportional to 1,200.98, 1,660.17 and 1,189.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.98 : 1,660.17 = 1,189.94 : x
2. Step 2: Convert to fraction form
   1,200.98/1,660.17 = 1,189.94/x
3. Step 3: Cross multiply
   1,200.98x = 1,660.17 × 1,189.94
4. Step 4: Simplify right side
   1,200.98x = 1,975,502.69
5. Step 5: Solve for x
   x = 1,975,502.69/1,200.98
6. Step 6: Final answer
   x = 1,644.91