Finding the Fourth Proportional to 1,399.79, 2,099.69 and 629.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.79 : 2,099.69 = 629.39 : x
2. Step 2: Convert to fraction form
   1,399.79/2,099.69 = 629.39/x
3. Step 3: Cross multiply
   1,399.79x = 2,099.69 × 629.39
4. Step 4: Simplify right side
   1,399.79x = 1,321,523.89
5. Step 5: Solve for x
   x = 1,321,523.89/1,399.79
6. Step 6: Final answer
   x = 944.09