Finding the Fourth Proportional to 1,190.29, 1,642.71 and 666.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,190.29 : 1,642.71 = 666.49 : x
2. Step 2: Convert to fraction form
   1,190.29/1,642.71 = 666.49/x
3. Step 3: Cross multiply
   1,190.29x = 1,642.71 × 666.49
4. Step 4: Simplify right side
   1,190.29x = 1,094,849.79
5. Step 5: Solve for x
   x = 1,094,849.79/1,190.29
6. Step 6: Final answer
   x = 919.82